---
id: CVE-2026-93864
title: >-
  Fireware OS Link Following in firewalld Allows Local Arbitrary File Overwrite
  as Root
summary: >-
  A link following vulnerability in WatchGuard Fireware OS’s firewall daemon
  allows a local attacker with code execution as a low-privileged system process
  to overwrite arbitrary files with root privileges, and to tamper with firewall
  IP s…
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H'
cvssSource: cna
cwe:
  - CWE-22
  - CWE-377
  - CWE-59
  - CWE-73
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
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-29T03:56:46.170650Z'
published: '2026-10-27'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T10:45:46.897Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-93864'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-93864'
tags:
  - cve.org
epss: 0.00133
epssPercentile: 0.02788
ingestedAt: '2026-10-27T16:11:59.473Z'
---

## Overview

A link following vulnerability in WatchGuard Fireware OS’s firewall daemon allows a local attacker with code execution as a low-privileged system process to overwrite arbitrary files with root privileges, and to tamper with firewall IP set data, by planting a crafted file system object and triggering a list update. Written content is partially constrained.

## 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