CVE-2026-13371

WatchGuard Firebox Management Web UI Denial of Service via Unsafe Deserialization

State: Published
Severity: 6.9 Medium
Published: Jul 2, 2026
Updated: Aug 27, 2026
Reserved: Jun 25, 2026

Description

An authenticated administrator can trigger a denial-of-service condition in the Fireware Management Web UI by sending malformed or crafted data to the put_data endpoint, which performs unsafe deserialization of the attacker-supplied input.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	WatchGuard

Weaknesses

CWE-502

Affected Products

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

References

https://psirt.watchguard.com/CVE-2026-13371vendor-advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00014vendor-advisory

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