CVE-2025-14733: WatchGuard Firebox Out of Bounds Write Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2025-12-19. EPSS: 26.5% chance of exploitation in the next 30 days.

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.

Affected products

• WatchGuard Fireware: from 11.10.2, before 12.5.15 (fixed in 12.5.15); from 11.10.2, before 12.11.6 (fixed in 12.11.6); from 2025.1, before 2025.1.4 (fixed in 2025.1.4)

Published 2025-12-19. Last modified 2026-09-09.