CVE-2026-3344: WatchGuard Firebox System Integrity Check Bypass

Severity: medium (CVSS 4.9 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: 2026-03-03 · updated 2026-08-10
Weakness: CWE-440

Description

A vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS filesystem integrity check and maintain limited persistence via a maliciously-crafted firmware update package.

Affected products

WatchGuard Fireware OS: from 12.0 before 12.11.8; from 12.5.9 before 12.5.17; from 2025.1 before 2026.1.2 — fixed in 12.11.8, 12.5.17, 2026.1.2

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 12.11.8, 12.5.17, 2026.1.2. Check the vendor advisory for mitigations.

References

https://psirt.watchguard.com/CVE-2026-3344
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00005

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