CVE-2026-113881

Medium

Description

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.

SeverityMedium

CVSS6.1

Exploit probability—

ProductFireware OS

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-121CWE-121 CWE-129CWE-129

How to fix

Update

WatchGuard Fireware OS2026.4, 12.12.4 or later

Vendor advisories

psirt.watchguard.com/CVE-2026-113881

Affected products

Product	Affected versions	Fixed in
WatchGuard Fireware OS	2025.1 ≤ v < 2026.4, 12.9 ≤ v < 12.12.4	2026.4, 12.12.4

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