CVE-2020-5135: SonicWall SonicOS Buffer Overflow Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: yes — in CISA KEV since 2022-03-15
EPSS: 26.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-12 · updated 2026-06-17
Weakness: CWE-120

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. 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.

Affected products

SonicWall SonicOS: through 6.0.5.3; from 6.5.0.0 through 6.5.1.11; from 6.5.4.0 through 6.5.4.7; 7.0.0.0
SonicWall SonicOSv: through 6.5.4.4

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-5135

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