CVE-2026-13050: WatchGuard Firebox networkd Out of Bounds Write Vulnerability

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-03 · updated 2026-10-25
Weakness: CWE-787

Description

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS networkd process could allow an authenticated privileged user to execute arbitrary code via a specially crafted requests to the Management Web UI.

Affected products

WatchGuard Fireware OS: from 2025.1 before 2026.2.1; from 12.5 before 12.5.19; from 11.0.0 before 11.12.4; from 12.0 before 12.12.1; 11.12.4, 11.12.4-u1 — fixed in 2026.2.1, 12.5.19, 11.12.4, 12.12.1

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 2026.2.1, 12.5.19, 11.12.4, 12.12.1. Check the vendor advisory for mitigations.

References

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