Firebox and Fireware OS
CVE-2026-13722: WatchGuard Firebox Firmware Image Validation Bypass in WatchGuard Fireware OS
WatchGuard Fireware OS contains a firmware validation bypass when processing a backup image via the backup/restore feature.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 4.0 8.6
EPSS0.33%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
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 (Default) 2025.1 | 2026.2.1 or later |
| Fireware OS (Default) 12.0 | 12.12.1 or later |
| Fireware OS (Default) 11.0 to 11.12.4+541730 | Upgrade past 11.12.4+541730; see the advisory |
| Fireware OS (EUCC) 12.0 | 12.11.9 or later |
| Fireware OS (T15/T35) 12.0 | * or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
WatchGuard Fireware OS contains a firmware validation bypass when processing a backup image via the backup/restore feature. An authenticated administrator can exploit this vulnerability to install a tampered firmware image.
Exploitation
WatchGuard is not aware of any exploitation of this vulnerability in the wild.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.