KEV Entry

CVE-2021-20090

Known Exploited Vulnerability Entry CISA

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Entry Details
Confirmed Exploited

CVE-2021-20090

2021-11-03 01:00 CET

Timestamps

2021-11-03

2021-11-03

Scope

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

References
  • {'id': 'CVE-2021-20090', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-20090'}

035d71ad-e2e1-445c-a77d-38be9c4d5917

CISA
405284c2-e461-4670-8979-7fd2c9755a60

2026-10-02 08:10 CEST

2026-10-02 08:10 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-22"
  ],
  "date_added": "2021-11-03",
  "due_date": "2021-11-17",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Buffalo Firmware",
  "vendorProject": "Arcadyan",
  "vulnerabilityName": "Arcadyan Buffalo Firmware Path Traversal Vulnerability"
}
 -
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