CVE-2026-86133 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Vendors	Products
Watchguard Subscribe	Fireware Os Subscribe

No data.

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No data.

Advisories

No advisories yet.

Fixes

Solution

Fireware OS 2026.3.2, Fireware OS 2026.2.3, Fireware OS 12.12.3, Fireware OS 12.5.21

Workaround

No workaround given by the vendor.

References

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

History

Tue, 29 Sep 2026 23:30:00 +0000

Type	Values Removed	Values Added
Description		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.
Title		Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service
First Time appeared		Watchguard Watchguard fireware Os
Weaknesses		CWE-1284 CWE-191
CPEs		cpe:2.3:a:watchguard:fireware_os::::::::
Vendors & Products		Watchguard Watchguard fireware Os
References		https://psirt.watchguard.com/CVE-2026-86133
Metrics		cvssV4_0 `{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: WatchGuard

Published: 2026-09-29T23:05:47.652Z

Updated: 2026-09-29T23:05:47.652Z

Reserved: 2026-09-05T03:00:39.457Z

Link: CVE-2026-86133

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-30T00:16:37.087

Modified: 2026-09-30T00:16:37.087

Link: CVE-2026-86133

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

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