Vulnerability-Lookup

CVE-2021-20090 (GCVE-0-2021-20090)

Vulnerability from cvelistv5 – Published: 2021-04-29 00:00 – Updated: 2025-10-21 23:25

CISA Previdian

Summary

A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-06 20:25 UTC

CWE

Path Traversal
CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

tenable mitre root Scorecard

References

4 references

URL	Tags
https://www.tenable.com/security/research/tra-2021-13
https://www.kb.cert.org/vuls/id/914124	third-party-advisory
https://www.secpod.com/blog/arcadyan-based-router…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

1 product

Vendor	Product	Version
n/a	Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3	Affected: WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 035d71ad-e2e1-445c-a77d-38be9c4d5917

Vulnerability ID: CVE-2021-20090

Status: Confirmed

Status Updated: 2021-11-03 01:00 CET

Exploited: Yes

Timestamps

First Seen: 2021-11-03

Asserted: 2021-11-03

Scope

Notes: Arcadyan Buffalo Firmware Path Traversal Vulnerability | Affected: Arcadyan / Buffalo Firmware | Description: Arcadyan Buffalo firmware contains a path traversal vulnerability that could allow unauthenticated, remote attackers to bypass authentication and access sensitive information. This vulnerability affects multiple routers across several different vendors. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-20090

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details

Cwes	CWE-22
Feed	CISA Known Exploited Vulnerabilities Catalog
Product	Buffalo Firmware
Due Date	2021-11-17
Date Added	2021-11-03
Vendorproject	Arcadyan
Vulnerabilityname	Arcadyan Buffalo Firmware Path Traversal Vulnerability
Knownransomwarecampaignuse	Unknown

References

CVE-2021-20090

Created: 2026-10-02 08:10 CEST | Updated: 2026-10-02 08:10 CEST

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: a6a90d01-be50-46f3-acc9-07c7bfb53331

Vulnerability ID: CVE-2021-20090

Status: Confirmed

Status Updated: 2021-11-03 01:00 CET

Exploited: Yes

Timestamps

First Seen: 2021-11-03

Asserted: 2021-11-03

Scope

Notes: A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <=... | Affected: Buffalo / Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3 | CVSS: 9.8 (CRITICAL) | EPSS: 0.99983 | Used in malware: unknown | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details

Feed	Previdian (previdian.com)
Title	A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <=...
Cve Id	CVE-2021-20090
Vendor	Buffalo
Ghsa Id	None
Product	Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3
Added Date	2021-11-03T00:00:00.000Z
Cvss Score	9.8
Epss Score	0.99983
Previous Ids
Cvss Severity	CRITICAL
Virtual Patch	False
Cvss Estimated	False
Epss Percentile	0.99982
Used In Malware	unknown
Vulnerability Id	CVE-2021-20090
Ahead Of Cisa Kev	None
Not Yet In Cisa Kev	False

References

Created: 2026-10-02 09:10 CEST | Updated: 2026-10-02 09:10 CEST

Show details on NVD website

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              "name": "VU#914124",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.kb.cert.org/vuls/id/914124"
            },
            {
              "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
        "assignerShortName": "tenable",
        "cveId": "CVE-2021-20090",
        "datePublished": "2021-04-29T00:00:00.000Z",
        "dateReserved": "2020-12-17T00:00:00.000Z",
        "dateUpdated": "2025-10-21T23:25:47.628Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}

BDU:2021-03989 (CVE-2021-20090)

Vulnerability from fstec – Published: 2021-08-10 – Updated: 2021-08-11 – View on bdu.fstec.ru Exploit publicly available Yes Fixed

CISA Previdian

Title

Уязвимость веб-интерфейса микропрограммного обеспечения Arcadyan маршрутизаторов Buffalo, позволяющая нарушителю обойти процесс аутентификации

Summary

Уязвимость веб-интерфейса микропрограммного обеспечения Arcadyan маршрутизаторов Buffalo связана с возможностью обхода пути к каталогу. Эксплуатация уязвимости может позволить нарушителю, действующему удаленно, обойти процесс аутентификации

Severity

10.0 (High) CVSS 2.0


                      
                        AV:N/AC:L/Au:N/C:C/I:C/A:C

9.8 (Critical) CVSS 3.0


                      
                        CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Class

Code vulnerability

Status

Confirmed by the vendor

Exploitation

Authentication bypass

Incidents

Yes

Remediation

Software update

CWE

CWE-22 - Неверное ограничение имени пути к каталогу с ограниченным доступом («Обход пути»)

Aliases

CVE-2021-20090

References

3 references

URL
https://www.tenable.com/security/research/tra-2021-13
https://www.kb.cert.org/vuls/id/914124
https://nvd.nist.gov/vuln/detail/CVE-2021-20090

Impacted products

6 products from 2 vendors

Vendors

Buffalo Technology, Arcadyan

Products

Buffalo wsr-2533dhpl2-bk, Buffalo wsr-2533dhp3-bk, ARV7519, VRV9517, VGV7519, VRV9518

Versions

до 1.02 (Buffalo wsr-2533dhpl2-bk), до 1.24 (Buffalo wsr-2533dhp3-bk), 00.96.00.96.617ES (ARV7519), 6.00.17 build04 (VRV9517), 3.01.116 (VGV7519), 1.01.00 build44 (VRV9518)

Product types

Network appliance software

Mitigations

Использование рекомендаций: https://www.tenable.com/security/research/tra-2021-13

JSON

To clipboard

{
  "CVSS 2.0": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
  "CVSS 3.0": "AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "CVSS 4.0": null,
  "remediation_\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": null,
  "remediation_\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435": null,
  "\u0412\u0435\u043d\u0434\u043e\u0440 \u041f\u041e": "Buffalo Technology, Arcadyan",
  "\u0412\u0435\u0440\u0441\u0438\u044f \u041f\u041e": "\u0434\u043e 1.02 (Buffalo wsr-2533dhpl2-bk), \u0434\u043e 1.24 (Buffalo wsr-2533dhp3-bk), 00.96.00.96.617ES (ARV7519), 6.00.17 build04 (VRV9517), 3.01.116 (VGV7519), 1.01.00 build44 (VRV9518)",
  "\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043c\u0435\u0440\u044b \u043f\u043e \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044e": "\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439:\nhttps://www.tenable.com/security/research/tra-2021-13",
  "\u0414\u0430\u0442\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f": "20.07.2021",
  "\u0414\u0430\u0442\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f": "11.08.2021",
  "\u0414\u0430\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438": "10.08.2021",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": "BDU:2021-03989",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "CVE-2021-20090",
  "\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430",
  "\u041a\u043b\u0430\u0441\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043e\u0434\u0430",
  "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u041f\u041e": "Buffalo wsr-2533dhpl2-bk, Buffalo wsr-2533dhp3-bk, ARV7519, VRV9517, VGV7519, VRV9518",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u041e\u0421 \u0438 \u0442\u0438\u043f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b": null,
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u0435\u0431-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u043c\u0438\u043a\u0440\u043e\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Arcadyan \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432 Buffalo, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438",
  "\u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0439\u0442\u0430": "\u0421\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "\u041d\u0435\u0432\u0435\u0440\u043d\u043e\u0435 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0435 \u0438\u043c\u0435\u043d\u0438 \u043f\u0443\u0442\u0438 \u043a \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0443 \u0441 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u043e\u043c (\u00ab\u041e\u0431\u0445\u043e\u0434 \u043f\u0443\u0442\u0438\u00bb) (CWE-22)",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u0435\u0431-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u043c\u0438\u043a\u0440\u043e\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Arcadyan \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432 Buffalo \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c\u044e \u043e\u0431\u0445\u043e\u0434\u0430 \u043f\u0443\u0442\u0438 \u043a \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0443. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0436\u0435\u0442  \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c  \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e, \u0434\u0435\u0439\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u043c\u0443 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u043e, \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438",
  "\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": null,
  "\u041f\u0440\u043e\u0447\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f": null,
  "\u0421\u0432\u044f\u0437\u044c \u0441 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430\u043c\u0438 \u0418\u0411": "\u0414\u0430",
  "\u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f": "\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438": "\u041d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u0435 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438",
  "\u0421\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0438": "https://www.tenable.com/security/research/tra-2021-13\nhttps://www.kb.cert.org/vuls/id/914124\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-20090",
  "\u0421\u0442\u0430\u0442\u0443\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u043c",
  "\u0422\u0438\u043f \u041f\u041e": "\u041f\u041e \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e-\u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0433\u043e \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430",
  "\u0422\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "CWE-22",
  "\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 2.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 10)\n\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 3.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 9,8)"
}

CNVD-2021-56801

Vulnerability from cnvd - Published: 2021-07-30

Title

Buffalo WSR-2533DHPL2和WSR-2533DHP3存在路径遍历漏洞

Description

Buffalo WSR-2533DHPL2和WSR-2533DHP3是日本Buffalo公司的路由器。 Buffalo WSR-2533DHPL2和WSR-2533DHP3存在路径遍历漏洞，该漏洞源于web界面处理目录遍历序列时出现输入验证错误，攻击者可利用该漏洞绕过身份验证。

Severity

高

Patch Name

Buffalo WSR-2533DHPL2和WSR-2533DHP3存在路径遍历漏洞的补丁

Patch Description

Buffalo WSR-2533DHPL2和WSR-2533DHP3是日本Buffalo公司的路由器。 Buffalo WSR-2533DHPL2和WSR-2533DHP3存在路径遍历漏洞，该漏洞源于web界面处理目录遍历序列时出现输入验证错误，攻击者可利用该漏洞绕过身份验证。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://www.buffalo.jp/news/detail/20210427-03.html

Reference

https://www.cybersecurity-help.cz/vdb/SB2021042705

Impacted products

Name
['BUFFALO Buffalo WSR-2533DHPL2 <=1.02', 'BUFFALO Buffalo WSR-2533DHP3 <=1.24']

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-20090",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-20090"
    }
  },
  "description": "Buffalo WSR-2533DHPL2\u548cWSR-2533DHP3\u662f\u65e5\u672cBuffalo\u516c\u53f8\u7684\u8def\u7531\u5668\u3002\n\nBuffalo WSR-2533DHPL2\u548cWSR-2533DHP3\u5b58\u5728\u8def\u5f84\u904d\u5386\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eweb\u754c\u9762\u5904\u7406\u76ee\u5f55\u904d\u5386\u5e8f\u5217\u65f6\u51fa\u73b0\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://www.buffalo.jp/news/detail/20210427-03.html",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-56801",
  "openTime": "2021-07-30",
  "patchDescription": "Buffalo WSR-2533DHPL2\u548cWSR-2533DHP3\u662f\u65e5\u672cBuffalo\u516c\u53f8\u7684\u8def\u7531\u5668\u3002\r\n\r\nBuffalo WSR-2533DHPL2\u548cWSR-2533DHP3\u5b58\u5728\u8def\u5f84\u904d\u5386\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eweb\u754c\u9762\u5904\u7406\u76ee\u5f55\u904d\u5386\u5e8f\u5217\u65f6\u51fa\u73b0\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Buffalo WSR-2533DHPL2\u548cWSR-2533DHP3\u5b58\u5728\u8def\u5f84\u904d\u5386\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": [
      "BUFFALO Buffalo WSR-2533DHPL2 \u003c=1.02",
      "BUFFALO Buffalo WSR-2533DHP3 \u003c=1.24"
    ]
  },
  "referenceLink": "https://www.cybersecurity-help.cz/vdb/SB2021042705",
  "serverity": "\u9ad8",
  "submitTime": "2021-04-28",
  "title": "Buffalo WSR-2533DHPL2\u548cWSR-2533DHP3\u5b58\u5728\u8def\u5f84\u904d\u5386\u6f0f\u6d1e"
}

EUVD-2026-255996

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 06:58

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T06:58:28.497593+00:00",
  "id": "EUVD-2026-255996"
}

FKIE_CVE-2021-20090

Vulnerability from fkie_nvd - Published: 2021-04-29 15:15 - Updated: 2026-06-17 03:33

CISA Previdian

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
vulnreport@tenable.com	https://www.kb.cert.org/vuls/id/914124	Third Party Advisory, US Government Resource
vulnreport@tenable.com	https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/	Exploit, Third Party Advisory
vulnreport@tenable.com	https://www.tenable.com/security/research/tra-2021-13	Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.kb.cert.org/vuls/id/914124	Third Party Advisory, US Government Resource
af854a3a-2127-422b-91ae-364da2661108	https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/	Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.tenable.com/security/research/tra-2021-13	Exploit, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20090	US Government Resource

Impacted products

Vendor	Product	Version
buffalo	wsr-2533dhpl2-bk_firmware	*
buffalo	wsr-2533dhpl2-bk	-
buffalo	wsr-2533dhp3-bk_firmware	*
buffalo	wsr-2533dhp3-bk	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "WSR-2533DHPL2 \u003c=1.02, WSR-2533DHP3 \u003c= 1.24"
            }
          ]
        }
      ],
      "source": "vulnreport@tenable.com"
    }
  ],
  "cisaActionDue": "2021-11-17",
  "cisaExploitAdd": "2021-11-03",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Arcadyan Buffalo Firmware Path Traversal Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D861729C-023B-4D73-8C4C-BF7E8B0B7045",
              "versionEndIncluding": "1.02",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:buffalo:wsr-2533dhpl2-bk:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "1B03FA14-33E3-44D2-8165-197CB446F2D2",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "63232EC8-B2B8-4867-93DB-C0C5147E2730",
              "versionEndIncluding": "1.24",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:buffalo:wsr-2533dhp3-bk:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "7AA91D93-E2B9-4415-B541-1968F1F39814",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de salto de ruta en las interfaces web de Buffalo WSR-2533DHPL2 versi\u00f3n de firmware anterior a 1.02 e incluy\u00e9ndola y WSR-2533DHP3 versi\u00f3n de firmware anterior a 1.24 e incluy\u00e9ndola, podr\u00eda permitir a atacantes remotos no autenticados omitir la autenticaci\u00f3n"
    }
  ],
  "id": "CVE-2021-20090",
  "lastModified": "2026-06-17T03:33:15.487",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-20090",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-02-06T20:25:22.891349Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-04-29T15:15:10.630",
  "references": [
    {
      "source": "vulnreport@tenable.com",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ],
      "url": "https://www.kb.cert.org/vuls/id/914124"
    },
    {
      "source": "vulnreport@tenable.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
    },
    {
      "source": "vulnreport@tenable.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://www.tenable.com/security/research/tra-2021-13"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory",
        "US Government Resource"
      ],
      "url": "https://www.kb.cert.org/vuls/id/914124"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://www.tenable.com/security/research/tra-2021-13"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20090"
    }
  ],
  "sourceIdentifier": "vulnreport@tenable.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

GHSA-6466-44WR-C6VV

Vulnerability from github – Published: 2022-05-24 17:49 – Updated: 2025-10-22 00:32

Details

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2021-20090"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-04-29T15:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication.",
  "id": "GHSA-6466-44wr-c6vv",
  "modified": "2025-10-22T00:32:07Z",
  "published": "2022-05-24T17:49:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20090"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20090"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/914124"
    },
    {
      "type": "WEB",
      "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation"
    },
    {
      "type": "WEB",
      "url": "https://www.tenable.com/security/research/tra-2021-13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GSD-2021-20090

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Aliases

CVE-2021-20090

Aliases

CVE-2021-20090

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-20090",
    "description": "A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication.",
    "id": "GSD-2021-20090"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-20090"
      ],
      "details": "A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication.",
      "id": "GSD-2021-20090",
      "modified": "2023-12-13T01:23:12.563623Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cisa.gov": {
      "cveID": "CVE-2021-20090",
      "dateAdded": "2021-11-03",
      "dueDate": "2021-11-17",
      "product": "Buffalo WSR-2533DHPL2 and WSR-2533DHP3 firmware",
      "requiredAction": "Apply updates per vendor instructions.",
      "shortDescription": "A path traversal vulnerability in Arcadyan firmware could allow unauthenticated remote attackers to bypass authentication. It impacts many routers.",
      "vendorProject": "Arcadyan",
      "vulnerabilityName": "Arcadyan Buffalo Firmware Multiple Versions Path Traversal"
    },
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "vulnreport@tenable.com",
        "ID": "CVE-2021-20090",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "WSR-2533DHPL2 \u003c=1.02, WSR-2533DHP3 \u003c= 1.24"
                        }
                      ]
                    }
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              "vendor_name": "n/a"
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          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
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                "lang": "eng",
                "value": "Path Traversal"
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      },
      "references": {
        "reference_data": [
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          },
          {
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            "refsource": "CERT-VN",
            "url": "https://www.kb.cert.org/vuls/id/914124"
          },
          {
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            "refsource": "MISC",
            "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
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        ]
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    },
    "nvd.nist.gov": {
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                  {
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                    "cpe_name": [],
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                    "vulnerable": true
                  }
                ],
                "operator": "OR"
              },
              {
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                "cpe_match": [
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                ],
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          },
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                    "versionEndIncluding": "1.24",
                    "vulnerable": true
                  }
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          "ID": "CVE-2021-20090"
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        "data_version": "4.0",
        "description": {
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            }
          ]
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        "problemtype": {
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            },
            {
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              "refsource": "CERT-VN",
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                "Third Party Advisory",
                "US Government Resource"
              ],
              "url": "https://www.kb.cert.org/vuls/id/914124"
            },
            {
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              "tags": [],
              "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 7.5,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "HIGH",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2023-10-18T01:15Z",
      "publishedDate": "2021-04-29T15:15Z"
    }
  }
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-20090 (GCVE-0-2021-20090)

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Vendor Report Successful Exploitation Confidence: 80% Source: cisa-kev

Details

References

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Successful Exploitation Confidence: 70% Source: previdian

Details

References

BDU:2021-03989 (CVE-2021-20090)

CNVD-2021-56801

EUVD-2026-255996

FKIE_CVE-2021-20090

GHSA-6466-44WR-C6VV

GSD-2021-20090

Tags

Sightings

Nomenclature

Related by attack behaviour