What’s Vulnerable › Vulnerabilities

CVE-2026-86131: Fireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code Execution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-10-06
• Weakness: CWE-94

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.

Affected products

• WatchGuard Fireware OS: from 12.0 before 12.5.21; from 12.12 before 12.12.3; from 2025.0 before 2026.2.3; from 2026.3 before 2026.3.2 — fixed in 12.12.3, 12.5.21, 2026.2.3, 2026.3.2

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 12.12.3, 12.5.21, 2026.2.3, 2026.3.2. Check the vendor advisory for mitigations.

References

• https://psirt.watchguard.com/CVE-2026-86131

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