CVE-2026-86131
Fireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code Execution
No known exploitation. EPSS puts it in the 34th percentile. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- WatchGuard Fireware OSAffected: ≥ 2026.3, < 2026.3.2Upgrade to: 2026.3.2Affected: ≥ 2025.0, < 2026.2.3Upgrade to: 2026.2.3Affected: ≥ 12.0, < 12.12.3Upgrade to: 12.12.3Stated by: CVE record
- Watchguard FirewareAffected: ≥ 12.0, < 12.5.21Upgrade to: 12.5.21Stated by: NVD
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.4% chance of exploitation activity in the next 30 days, which ranks it in the 34th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
14 events over 7 days, from the signal feeds we watch.
- Patch availablerecord updated
- Patch availablepatch available, record updated, record updated
- Patch availablepatch available, record updated, record updated
- Patch availablepublished, weakness classified, att&ck mapped
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Scored 9.8 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
Watch the software you run.
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We'll flag the next CVE, public exploit or patch for Fireware OS, not every advisory.
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