SonicOS Post-Auth Format String Crash CVE-2026-0400
CVE-2026-0400 Published on February 24, 2026
A post-authentication Format String vulnerability in SonicOS allows a remote attacker to crash a firewall.
Vulnerability Analysis
CVE-2026-0400 is exploitable with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Use of Externally-Controlled Format String
The software uses a function that accepts a format string as an argument, but the format string originates from an external source.
Products Associated with CVE-2026-0400
Want to know whenever a new CVE is published for SonicWall Sonicos? stack.watch will email you.
Affected Versions
SonicWall SonicOS:- Version 7.0.1-5169 and older versions is affected.
- Version 7.3.1-7013 and older versions is affected.
- Version 8.1.0-8017 and older versions is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.