SonicOS firewalls
CVE-2025-40600: Use of Externally-Controlled Format String in SonicOS
Use of Externally-Controlled Format String vulnerability in the SonicOS SSL VPN interface allows a remote unauthenticated attacker to cause service disruption.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityCRITICALCVSS 3.1 9.8
EPSS0.91%Chance of exploitation in 30 days
Public exploitNot tracked
FixSee advisory
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| SonicOS (Gen7, Linux) 7.2 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Use of Externally-Controlled Format String vulnerability in the SonicOS SSL VPN interface allows a remote unauthenticated attacker to cause service disruption.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.