CVE-2026-19317

Fireware OS Pre-Authentication Out-of-Bounds Read in iked Allows Denial of Service (DoS)

State: Published
Severity: 8.7 High
Published: Aug 27, 2026
Updated: Sep 3, 2026
Reserved: Aug 7, 2026

Description

An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.

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	2025.0 to before 2026.2.2Affected 12.0 to before 12.12.2Affected 2026.3 to before 2026.3.1Affected
Fireware OSWatchGuard	12.0 to before 12.5.20Affected

References

https://psirt.watchguard.com/CVE-2026-19317vendor-advisory

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