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CVE-2026-86131

Watchguard Fireware code injection

9.8 CRITICALEPSS 0.42%
  1. Published29 Sept 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Watchguard Fireware≥ 12.0 < 12.5.21 · ≥ 12.12 < 12.12.3 · ≥ 2025.0 < 2026.2.3 · ≥ 2026.3 < 2026.3.2

Remediation

Fixed in
Watchguard Fireware≥ 12.5.21

References

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Frequently asked

Is CVE-2026-86131 being actively exploited?

CVE-2026-86131 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-86131?

CVE-2026-86131 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-86131?

Affected products include Watchguard Fireware.

How do I fix CVE-2026-86131?

Upgrade affected software to a fixed version, for example Watchguard Fireware 12.5.21 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-86131 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.