---
id: CVE-2025-13940
title: >-
  An Expected Behavior Violation [CWE-440] vulnerability in WatchGuard Fireware
  OS may allow an attacker to bypass the Fireware OS boot time system integrity
  check and prevent the Firebox from shutting down in the event of a system
  integri…
summary: >-
  An Expected Behavior Violation [CWE-440] vulnerability in WatchGuard Fireware
  OS may allow an attacker to bypass the Fireware OS boot time system integrity
  check and prevent the Firebox from shutting down in the event of a system
  integri…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-440
vendor: watchguard
product: fireware
affected:
  - 'fireware >= 2025.1, < 2025.1.3'
  - 'fireware >= 12.8.1, < 12.11.5'
patched:
  - fireware 12.11.5
published: '2025-12-04'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T23:10:00.463'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-13940'
references:
  - url: 'https://psirt.watchguard.com/CVE-2025-13940'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
  - url: 'https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00026'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
tags:
  - nvd
epss: 0.00125
epssPercentile: 0.01894
ingestedAt: '2026-09-25T23:21:16.882Z'
---

## Overview

An Expected Behavior Violation [CWE-440] vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS boot time system integrity check and prevent the Firebox from shutting down in the event of a system integrity check failure. The on-demand system integrity check in the Fireware Web UI will correctly show a failed system integrity check message in the event of a failure.

## Affected

- `fireware >= 2025.1, < 2025.1.3`
- `fireware >= 12.8.1, < 12.11.5`

## Remediation

Upgrade past the affected range:

- `fireware 12.11.5`