SonicOS firewalls
CVE-2025-40601: Stack-based buffer overflow in SonicOS
A Stack-based buffer overflow vulnerability in the SonicOS SSLVPN service allows a remote unauthenticated attacker to cause Denial of Service (DoS), which could cause an impacted firewall to crash.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 3.1 7.5
EPSS1.2%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 (Linux) 7.3 | See the advisory |
| SonicOS (Linux) 8.0 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Stack-based buffer overflow vulnerability in the SonicOS SSLVPN service allows a remote unauthenticated attacker to cause Denial of Service (DoS), which could cause an impacted firewall to crash.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.