CVE-2026-8247

WatchGuard Firebox admd Out of Bounds Write Vulnerability

State: Published
Severity: 7.7 High
Published: Jul 2, 2026
Updated: Aug 27, 2026
Reserved: May 10, 2026

Description

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code.

This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	WatchGuard

Weaknesses

CWE-120

Affected Products

Product	Versions
Fireware OSWatchGuard	2025.1 to before 2026.2.1Affected 12.0 to before 12.12.1Affected 11.0 and laterAffected
Fireware OSWatchGuard	12.0 to before 12.11.9Affected
Fireware OSWatchGuard	12.0 to before 12.5.19Affected

References

https://psirt.watchguard.com/CVE-2026-8247vendor-advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00026vendor-advisory

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