CVE-2026-111107

Fireware OS NULL Pointer Dereference in Management Interface Allows Unauthenticated Denial of Service

State: Published
Severity: 8.7 High
Published: Oct 27, 2026
Updated: Oct 27, 2026
Reserved: Oct 15, 2026

Description

A NULL pointer dereference vulnerability in WatchGuard Fireware OS’s management interface allows a remote, unauthenticated attacker with network access to the management interface to crash the management service by sending a specially crafted login request. Repeated exploitation terminates all active administrator sessions and in-progress management operations and can prevent management of the device. Traffic processing is not affected.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	WatchGuard

Weaknesses

Affected Products

Product	Versions
Fireware OSWatchGuard	2025.1 to before 2026.4Affected 12.0 to before 12.12.4Affected
Fireware OSWatchGuard	12.0 to before 12.5.22Affected

References

https://psirt.watchguard.com/CVE-2026-111107vendor-advisory

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