WatchGuard · Firebox
CVE-2025-9242
WatchGuard Firebox iked Out of Bounds Write Vulnerability
What it is
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.
CISA: WatchGuard Firebox contains an out-of-bounds write vulnerability in the OS iked process that may allow a remote unauthenticated attacker to execute arbitrary code.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: December 3, 2025
More exploited flaws from WatchGuard
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Dec 19, 2025 | Out of Bounds Write | Firebox | Critical 9.3 | 29% |
| Apr 11, 2022 | Privilege Escalation | Firebox and XTM | High 8.8 | 11% |
| Mar 25, 2022 | Arbitrary Code Execution | Firebox and XTM Appliances | Critical 9.8 | 78% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.