CVE-2026-86131
Received Received - Intake

Code Injection in WatchGuard Fireware OS via BOVPN Over TLS

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: WatchGuard Technologies, Inc.

Description
A code injection vulnerability in WatchGuard Fireware OS's BOVPN Over TLS client configuration handling allows an attacker who controls the remote VPN server to execute arbitrary commands as root on the connecting Firebox.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-86131
EUVD
EUVD-2026-89497

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
watchguard fireware_os From 2026.3 (inc) to 2026.3.2 (inc)
watchguard fireware_os From 2025.0 (inc) to 2026.2.3 (inc)
watchguard fireware_os From 12.0 (inc) to 12.12.3 (inc)
watchguard fireware_os From 12.0 (inc) to 12.5.21 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
CWE-829 The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.
CWE-295 The product does not validate, or incorrectly validates, a certificate.

Attack-Flow Graph

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Executive Summary

This is a code injection vulnerability in WatchGuard Fireware OS's BOVPN Over TLS client configuration handling. An attacker who controls the remote VPN server can exploit this to execute arbitrary commands as root on the connecting Firebox device.

Detection Guidance

To detect this vulnerability, check the Fireware OS version on your WatchGuard device. Affected versions include 2026.3 to 2026.3.2, 2025.0 to 2026.2.3, 12.0 to 12.12.3, and T15/T35 models running 12.0 to 12.5.21. Use the command 'show version' on the device CLI to verify the version.

Impact Analysis

If exploited, this vulnerability allows an attacker to gain full root access to your Firebox device. This could lead to complete system compromise, data theft, unauthorized network access, or disruption of services. The impact is severe due to the elevated privileges obtained.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating compliance requirements under GDPR and HIPAA. Organizations may face legal penalties, data breach notifications, and reputational damage if exploited.

Mitigation Strategies

Immediately update Fireware OS to a patched version: 2026.3.2, 2026.2.3, 12.12.3, or 12.5.21. Disable BOVPN Over TLS if not required. Monitor network traffic for unusual activity from VPN connections.

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