CVE-2025-11838: WatchGuard Firebox iked Memory Corruption Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-04 · updated 2026-09-25
Weakness: CWE-763

Description

A memory corruption vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker to trigger a Denial of Service (DoS) condition in the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer.

Affected products

WatchGuard Fireware OS: from 2025.1 before 2025.1.3; from 12.0.0 before 12.11.5 — fixed in 12.11.5, 2025.1.3

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 12.11.5, 2025.1.3. Check the vendor advisory for mitigations.

References

https://psirt.watchguard.com/CVE-2025-11838
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00018

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