Firebox and Fireware OS
CVE-2026-3342: WatchGuard Firebox Out of Bounds Write Vulnerability
An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an authenticated privileged administrator to execute arbitrary code with root permissions via an exposed management interface.
Published
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 |
|---|---|
| Fireware OS 11.9 to 11.12.4+541730 | Upgrade past 11.12.4+541730; see the advisory |
| Fireware OS 12.0 to 12.11.7 | Upgrade past 12.11.7; see the advisory |
| Fireware OS 12.5 to 12.5.16 | Upgrade past 12.5.16; see the advisory |
| Fireware OS 2025.1 to 2026.1.1 | Upgrade past 2026.1.1; see the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an authenticated privileged administrator to execute arbitrary code with root permissions via an exposed management interface.
This vulnerability affects Fireware OS 11.9 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.
Exploitation
WatchGuard is not aware of any exploitation of this issue in the wild.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.