SonicOS firewalls
CVE-2026-0399: Multiple post-authentication stack-based buffer overflow in SonicOS
Multiple post-authentication stack-based buffer overflow vulnerabilities in the SonicOS management interface due to improper bounds checking in a API endpoint.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 4.9
EPSS0.33%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, Gen7, Gen8) 7.0 | See the advisory |
| SonicOS (Linux, Gen7, Gen8) 7.3 | See the advisory |
| SonicOS (Linux, Gen7, Gen8) 8.1 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Multiple post-authentication stack-based buffer overflow vulnerabilities in the SonicOS management interface due to improper bounds checking in a API endpoint.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.