CVE-2025-12026 WatchGuard Firebox Authenticated Out of Bounds Write in certd
An authenticated privileged user can execute arbitrary code on WatchGuard Firebox devices via specially crafted CLI commands exploiting an out-of-bounds write.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-12026?
CVE-2025-12026 is a high-severity memory corruption vulnerability in Watchguard Fireware, published on 4 Dec 2025. 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 certificate request command could allow an authenticated privileged user to execute arbitrary code via specially crafted CLI commands.
Weakness: CWE-787
Which versions are affected by CVE-2025-12026?
It affects 1 product.
Products include Watchguard Fireware.
How do I fix CVE-2025-12026?
No fix has been published for CVE-2025-12026 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-2025-12026 being exploited?
There is no known exploitation of CVE-2025-12026 in the wild and no public exploit code.
Other vulnerabilities in Watchguard Fireware
Sources
Also known as GHSA-fj6v-mwp3-rwm2.