---
id: CVE-2026-104381
title: >-
  Fireware OS Missing Authentication in FireCluster State Sync Allows BOVPN
  Tunnel Denial of Service
summary: >-
  A missing authentication vulnerability in Fireware OS's FireCluster state
  synchronization feature allows an unauthenticated attacker positioned on the
  cluster synchronization network segment to force premature VPN tunnel
  termination by s…
severity: medium
cvss: 6
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-294
  - CWE-306
  - CWE-345
vendor: WatchGuard
product: Fireware OS
affected:
  - fireware_os >= 2025.1 < 2026.4
  - fireware_os >= 12.0 < 12.12.4
  - fireware_os >= 12.0 < 12.5.22
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T15:52:27.697Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-104381'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-104381'
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.472Z'
---

## Overview

A missing authentication vulnerability in Fireware OS's FireCluster state synchronization feature allows an unauthenticated attacker positioned on the cluster synchronization network segment to force premature VPN tunnel termination by sending crafted cluster synchronization traffic.

## Affected

- `fireware_os >= 2025.1 < 2026.4`
- `fireware_os >= 12.0 < 12.12.4`
- `fireware_os >= 12.0 < 12.5.22`

## Remediation

Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22