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Findings

CVE-2020-5135

SonicWall SonicOS Buffer Overflow Vulnerability

Published Oct 12, 2020 · updated Jun 16, 2026 · sonicwall sonicos

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.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 12, 2020 · Catalog

    Detected

    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.

  2. Mar 15, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Apr 5, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Required action

Apply updates per vendor instructions.

CISA due date Apr 5, 2022

Affected

  • cpe sonicwall/sonicosversion unspecified
  • cpe sonicwall/sonicos7.0.0.0
  • cpe sonicwall/sonicosvversion unspecified
  • vendor SonicWall SonicOSversion unspecified

Sources

  • CISA KEVConfirmed exploitationCVE-2020-5135

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-5135

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-5135

    30-day exploitation probability 26.9%

    first.org
  • NIST NVDVulnerability recordCVE-2020-5135

    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

    nvd.nist.gov

References