---
title: "CVE-2026-86131: WatchGuard Fireware OS - Command Injection"
description: "WatchGuard Fireware OS contains a command injection caused by improper handling of BOVPN Over TLS client configuration, letting attackers controlling the remote VPN server execute arbitrary commands as root, exploit requires attacker to control remote VPN server."
url: https://panop.io/threat-heartbeat/CVE-2026-86131/
---

# CVE-2026-86131 WatchGuard Fireware OS - Command Injection

WatchGuard Fireware OS contains a command injection caused by improper handling of BOVPN Over TLS client configuration, letting attackers controlling the remote VPN server execute arbitrary commands as root, exploit requires attacker to control remote VPN server.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.42% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-86131)

## Details

Type

Command Injection

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

30 September 2026

Updated

15 October 2026

Weakness

[CWE-94](https://cwe.mitre.org/data/definitions/94.html)

## Vendor fix

Update to the latest Fireware OS version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-86131](https://nvd.nist.gov/vuln/detail/CVE-2026-86131)
- [https://psirt.watchguard.com/CVE-2026-86131](https://psirt.watchguard.com/CVE-2026-86131)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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