CVE-2026-13368: WatchGuard Firebox Race Condition and Use-After-Free in Mobile VPN with IKEv2 LDAP Authentication

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-03 · updated 2026-10-25
Weakness: CWE-416

Description

WatchGuard Fireware OS contains a race condition leading to a use-after-free vulnerability in LDAP authentication for the Mobile User VPN with IKEv2. A remote unauthenticated attacker could exploit this vulnerability to execute arbitrary code in the context of the iked process on Fireboxes that have a Mobile VPN with IKEv2 configured to use an external LDAP authentication server.

Affected products

WatchGuard Fireware OS: from 2025.1 before 2026.2.1; from 12.5 before 12.5.19; from 11.0.0 before 11.12.4; from 12.0 before 12.12.1; 11.12.4, 11.12.4-u1 — fixed in 2026.2.1, 12.5.19, 11.12.4, 12.12.1

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 2026.2.1, 12.5.19, 11.12.4, 12.12.1. Check the vendor advisory for mitigations.

References

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