CVE-2025-9242 WatchGuard Firebox Out-of-Bounds Write
Remote unauthenticated attackers can execute arbitrary code on WatchGuard Firebox devices via an out-of-bounds write in the iked process.
- Exploited in the wild
- Since 12 Nov 2025
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-9242?
CVE-2025-9242 is a critical memory corruption vulnerability in Watchguard Fireware, published on 17 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the mobile user VPN with IKEv2 and the branch office VPN using IKEv2 when configured with a dynamic gateway peer. If the Firebox was previously configured with the mobile user VPN with IKEv2 or a branch office VPN using IKEv2 to a dynamic gateway peer, and both of those configurations have since been deleted, that Firebox may still be vulnerable if a branch office VPN to a static gateway peer is still configured.
Weakness: CWE-787
Which versions are affected by CVE-2025-9242?
It affects 1 product.
Products include Watchguard Fireware.
How do I fix CVE-2025-9242?
No fix has been published for CVE-2025-9242 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 Dec 2025.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-9242 being exploited?
Yes. Attackers have exploited CVE-2025-9242 in the wild since at least 12 Nov 2025.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Watchguard Fireware
Sources
Also known as GHSA-g6q4-chqv-724q.