CVE-2026-13722: WatchGuard Firebox Firmware Image Validation Bypass in WatchGuard Fireware OS

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-03 · updated 2026-10-25
Weakness: CWE-347

Description

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.

Affected products

WatchGuard Fireware OS: from 2025.1 before 2026.2.1; from 12.5 through 12.5.18; from 12.0 before 12.12.1; from 11.0.0 before 11.12.4; 11.12.4, 11.12.4-u1 — fixed in 2026.2.1, 12.12.1, 11.12.4

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 2026.2.1, 12.12.1, 11.12.4. Check the vendor advisory for mitigations.

References

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