---
id: CVE-2026-19313
title: >-
  An heap overflow vulnerability in the WatchGuard Fireware OS iked process
  allows a remote unauthenticated attacker to execute arbitrary code by sending
  specially crafted network traffic.
summary: >-
  An heap overflow vulnerability in the WatchGuard Fireware OS iked process
  allows a remote unauthenticated attacker to execute arbitrary code by sending
  specially crafted network traffic.
severity: critical
cwe:
  - CWE-122
  - CWE-190
  - CWE-680
published: '2026-08-28'
updated: '2026-08-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19313'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-19313'
    label: 5d1c2695-1a31-4499-88ae-e847036fd7e3
tags:
  - nvd
  - cve.org
epss: 0.00471
epssPercentile: 0.38163
ingestedAt: '2026-08-29T21:42:36.571Z'
vendor: WatchGuard
product: Fireware OS
affected:
  - fireware_os >= 2025.0 < 2026.2.2
  - fireware_os >= 12.0 < 12.12.2
  - fireware_os >= 12.0 < 12.5.20
  - fireware_os >= 2026.3 < 2026.3.1
cvss: 9.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-08-28T00:00:00+00:00'
cvssSource: cna
---

## Overview

An heap overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.