CVE-2020-5135 (GCVE-0-2020-5135)

Vulnerability from cvelistv5 – Published: 2020-10-12 10:40 – Updated: 2025-10-21 23:35
VLAI CISA Previdian
Summary
A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-06 19:55 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input
References
Impacted products
Vendor Product Version
SonicWall SonicOS Affected: SonicOS 6.5.4.7-79n and earlier
Affected: SonicOS 6.5.1.11-4n and earlier
Affected: SonicOS 6.0.5.3-93o and earlier
Affected: SonicOSv 6.5.4.4-44v-21-794 and earlier
Affected: SonicOS 7.0.0.0-1
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2020-5135

Status: Confirmed

Status Updated: 2022-03-15 01:00 CET

Exploited: Yes


Timestamps
First Seen: 2022-03-15
Asserted: 2022-03-15

Scope
Notes: SonicWall SonicOS Buffer Overflow Vulnerability | Affected: SonicWall / SonicOS | Description: A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. | Required action: Apply updates per vendor instructions. | Due date: 2022-04-05 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2020-5135

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-120
Feed CISA Known Exploited Vulnerabilities Catalog
Product SonicOS
Due Date 2022-04-05
Date Added 2022-03-15
Vendorproject SonicWall
Vulnerabilityname SonicWall SonicOS Buffer Overflow Vulnerability
Knownransomwarecampaignuse Known

References

Created: 2026-10-02 08:10 CEST | Updated: 2026-10-02 08:10 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2020-5135

Status: Confirmed

Status Updated: 2022-03-15 01:00 CET

Exploited: Yes


Timestamps
First Seen: 2022-03-15
Asserted: 2022-03-15

Scope
Notes: A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by... | Affected: SonicWall / SonicOS | CVSS: 9.8 (CRITICAL) | EPSS: 0.26869 | 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 buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by...
Cve Id CVE-2020-5135
Vendor SonicWall
Ghsa Id None
Product SonicOS
Added Date 2022-03-15T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.26869
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.97978
Used In Malware unknown
Vulnerability Id CVE-2020-5135
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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            "orgId": "44b2ff79-1416-4492-88bb-ed0da00c7315",
            "shortName": "sonicwall"
          },
          "references": [
            {
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010"
            }
          ],
          "x_legacyV4Record": {
            "CVE_data_meta": {
              "ASSIGNER": "PSIRT@sonicwall.com",
              "ID": "CVE-2020-5135",
              "STATE": "PUBLIC"
            },
            "affects": {
              "vendor": {
                "vendor_data": [
                  {
                    "product": {
                      "product_data": [
                        {
                          "product_name": "SonicOS",
                          "version": {
                            "version_data": [
                              {
                                "version_value": "SonicOS 6.5.4.7-79n and earlier"
                              },
                              {
                                "version_value": "SonicOS 6.5.1.11-4n and earlier"
                              },
                              {
                                "version_value": "SonicOS 6.0.5.3-93o and earlier"
                              },
                              {
                                "version_value": "SonicOSv 6.5.4.4-44v-21-794 and earlier"
                              },
                              {
                                "version_value": "SonicOS 7.0.0.0-1"
                              }
                            ]
                          }
                        }
                      ]
                    },
                    "vendor_name": "SonicWall"
                  }
                ]
              }
            },
            "data_format": "MITRE",
            "data_type": "CVE",
            "data_version": "4.0",
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0."
                }
              ]
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "CWE-120: Buffer Copy without Checking Size of Input"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010",
                  "refsource": "CONFIRM",
                  "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010"
                }
              ]
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "44b2ff79-1416-4492-88bb-ed0da00c7315",
        "assignerShortName": "sonicwall",
        "cveId": "CVE-2020-5135",
        "datePublished": "2020-10-12T10:40:28.000Z",
        "dateReserved": "2019-12-31T00:00:00.000Z",
        "dateUpdated": "2025-10-21T23:35:35.728Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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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.


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