CVE-2025-13940 WatchGuard Firebox Boot Time System Integrity Check Bypass

What is CVE-2025-13940?

CVE-2025-13940 is a medium-severity vulnerability in Watchguard Fireware, published on 4 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An Expected Behavior Violation [CWE-440] vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS boot time system integrity check and prevent the Firebox from shutting down in the event of a system integrity check failure. The on-demand system integrity check in the Fireware Web UI will correctly show a failed system integrity check message in the event of a failure.

Weakness: CWE-440

Which versions are affected by CVE-2025-13940?

It affects 1 product.

Products include Watchguard Fireware.

How do I fix CVE-2025-13940?

No fix has been published for CVE-2025-13940 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-13940 being exploited?

There is no known exploitation of CVE-2025-13940 in the wild and no public exploit code.

Other vulnerabilities in Watchguard Fireware

• CVE-2022-26318 WatchGuard Firebox and XTM Appliances Arbitrary Code Execution Exploited Critical 9.8
• CVE-2025-14733 WatchGuard Firebox Out of Bounds Write Exploited Critical 9.3
• CVE-2025-9242 WatchGuard Firebox Out-of-Bounds Write Exploited Critical 9.3
• CVE-2022-23176 WatchGuard Firebox and XTM Privilege Escalation Exploited High 8.8
• CVE-2022-31789 Integer overflow in n/a Critical 9.8

All Watchguard Fireware vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-pw6w-rvw4-j57r.