CVE-2026-81433

Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution

State: Published
Severity: 8.7 High
Published: Sep 29, 2026
Updated: Oct 1, 2026
Reserved: Aug 26, 2026

Description

A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.

Scores

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

Weaknesses

Affected Products

Product	Versions
Fireware OSWatchGuard	2026.3 to before 2026.3.2Affected 2025.0 to before 2026.2.3Affected 12.0 to before 12.12.3Affected

References

https://psirt.watchguard.com/CVE-2026-81433vendor-advisory

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