---
id: CVE-2025-11838
title: >-
  A memory corruption vulnerability in WatchGuard Fireware OS may allow an
  unauthenticated attacker to trigger a Denial of Service (DoS) condition in the
  Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when
  configured with…
summary: >-
  A memory corruption vulnerability in WatchGuard Fireware OS may allow an
  unauthenticated attacker to trigger a Denial of Service (DoS) condition in the
  Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when
  configured with…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-763
vendor: watchguard
product: fireware
affected:
  - 'fireware >= 2025.1, < 2025.1.3'
  - 'fireware >= 12.0.0, < 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-2025-11838'
references:
  - url: 'https://psirt.watchguard.com/CVE-2025-11838'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
  - url: 'https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00018'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
tags:
  - nvd
epss: 0.00495
epssPercentile: 0.39909
ingestedAt: '2026-09-25T23:21:16.880Z'
---

## Overview

A memory corruption vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker to trigger a Denial of Service (DoS) condition in the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer.

## Affected

- `fireware >= 2025.1, < 2025.1.3`
- `fireware >= 12.0.0, < 12.11.5`

## Remediation

Upgrade past the affected range:

- `fireware 12.11.5`