CVE-2026-19318

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

State: Published
Severity: 9.3 Critical
Published: Aug 27, 2026
Updated: Sep 3, 2026
Reserved: Aug 7, 2026

Description

A stack-based buffer overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/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	2025.0 to before 2026.2.2Affected 12.0 to before 12.12.2Affected
Fireware OSWatchGuard	12.0 to before 12.5.20Affected 2026.3 to before 2026.3.1Affected

References

https://psirt.watchguard.com/CVE-2026-19318vendor-advisory

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