CVE-2021-20031: SonicWall SonicOS

Medium severity, CVSS 6.1. EPSS: 13% chance of exploitation in the next 30 days.

A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary web domains.

Affected products

• SonicWall SonicOS: up to and including 7.0.1-r1262; up to and including 7.0.1-r1283; up to and including 7.0.1-r579; up to and including 6.5.4.7; up to and including 6.5.1.12; up to and including 6.0.5.3-94o; …

Published 2021-10-12. Last modified 2026-06-17.