CVE-2020-5139: SonicWall SonicOS

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

A vulnerability in SonicOS SSLVPN service allows a remote unauthenticated attacker to cause Denial of Service (DoS) due to the release of Invalid pointer and leads to a firewall crash. This vulnerability affected SonicOS Gen 5 version 5.9.1.7, 5.9.1.13, Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version SonicOS 7.0.0.0.

Affected products

• SonicWall SonicOS: up to and including 5.9.1.13; from 6.0.0.0, up to and including 6.0.5.3; from 6.5.0.0, up to and including 6.5.1.11; from 6.5.4.0, up to and including 6.5.4.7; version 7.0.0.0 only
• SonicWall Sonicosv: up to and including 6.5.4.4

Published 2020-10-12. Last modified 2026-06-17.