CVE-2026-86133 — Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service

CVE-2026-86133

Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service PUBLISHED

Description (CNA)

An integer underflow vulnerability in the WatchGuard Fireware OS IKE daemon (iked) allows a remote attacker who has completed the initial IKEv2 handshake to crash the iked process by sending a specially crafted encrypted IKEv2 message, resulting in a denial of service.

Affected (CNA)

Vendor / product	Versions
WatchGuard / Fireware OS	affected 2026.3 before 2026.3.2; affected 2025.0 before 2026.2.3; affected 12.0 before 12.12.3
WatchGuard / Fireware OS	affected 12.0 before 12.5.21

CWE

CWE-1284, CWE-191

References

https://psirt.watchguard.com/CVE-2026-86133

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.