Is CVE-2026-86131 being actively exploited?

CVE-2026-86131 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-86131?

CVE-2026-86131 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2026-86131

CRITICAL · CVSS 9.8EPSS 0.4%EU EUVD

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.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-94
EPSS score: 0.4% (35th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-89497)
Published: September 30, 2026
NVD last modified: October 6, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-89497 in the EU Vulnerability Database. Last updated in EUVD on October 1, 2026.

View on the EU Vulnerability Database

Affected products

watchguard / fireware

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

WatchGuard Fireware OS v12.3.1.B585922 (Running on Firebox Security Appliances) with WatchGuard Dimension 2.1.2.B588050 Software - WatchGuard Technologies Inc. - Common Criteria 2018-26-INF-3091 - archived

References

https://psirt.watchguard.com/CVE-2026-86131(Patch, Vendor Advisory)

Last updated October 8, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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