CVE-2026-113881#

Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged Code Execution

Medium 6.1 CVSS v4.0 › Published 2026-10-27Updated 2026-10-27

Summary #

A stack-based buffer overflow vulnerability in Fireware OS's VPN Network Access Enforcement process allows an authenticated mobile VPN user to create a denial of service condition and potentially execute arbitrary code as an unprivileged process by sending a specially crafted request.

Product status #

Product	Affected	Not affected
Fireware OS
Default	>= 2025.1, < 2026.4, >= 12.9, < 12.12.4	>= 2026.4, >= 12.12.4

Required Configuration for Exposure #

This vulnerability affects Firebox deployments with Network Access Control enabled for a Mobile VPN.

Weakness Type and Impact #

CWECWE-121Stack-based Buffer Overflow
CWECWE-129Improper Validation of Array Index
CAPECCAPEC-100Overflow Buffers

Exploitation Status #

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solution #

Fireware OS 2026.4, Fireware OS 12.12.4

References #

Credits #

WatchGuard AI Security Researchfinder