CVE-2026-13084: WatchGuard Fireware

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A null pointer dereference vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to create a denial-of-service (DoS) condition by sending specially crafted IKEv2 messages. This vulnerability affects both the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer. This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2

Affected products

• WatchGuard Fireware: from 12.5, before 12.5.19 (fixed in 12.5.19); from 11.0.0, before 11.12.4 (fixed in 11.12.4); version 11.12.4 only; from 12.0, before 12.12.1 (fixed in 12.12.1); from 2025.1, before 2026.2.1 (fixed in 2026.2.1)

Published 2026-07-03. Last modified 2026-08-28.