CVE-2026-13053 WatchGuard Firebox Authenticated Out of Bounds Write in Management CLI Command Handler

What is CVE-2026-13053?

CVE-2026-13053 is a high-severity memory corruption vulnerability in Watchguard Fireware, published on 2 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS's CLI could allow an authenticated privileged user to execute arbitrary code via a specially crafted CLI command.

Weakness: CWE-787

Which versions are affected by CVE-2026-13053?

It affects 1 product.

Products include Watchguard Fireware.

How do I fix CVE-2026-13053?

No fix has been published for CVE-2026-13053 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-13053 being exploited?

There is no known exploitation of CVE-2026-13053 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-mh9h-xjv7-9f27.