SonicOS firewalls
CVE-2023-0656: Stack-based buffer overflow in SonicOS
A Stack-based buffer overflow vulnerability in the SonicOS 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
SeverityUnknown
EPSS41%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 SonicOS NSv 6.5 | See the advisory |
| SonicOS SonicOS NSsp 7.0 | See the advisory |
| SonicOS SonicOS 7.0 | 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 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.