CVE-2026-13384: WatchGuard Firebox wgagent Out of Bounds Write Vulnerability

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% 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 wgagent 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 12.1 before 12.12.1; from 2025.1 before 2026.2.1; from 12.5 through 12.5.18 — fixed in 12.12.1, 2026.2.1

How to fix

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

References

https://psirt.watchguard.com/CVE-2026-13384
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00021

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