CVE-2026-86134 - Vulnerability Details - OpenCVE

A NULL pointer dereference vulnerability in the WatchGuard Fireware OS authentication process allows a remote, unauthenticated attacker to crash the management daemon by sending a specially request to the login interface, resulting in a denial of service.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

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.

No data.

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-2026-86134

History

Wed, 30 Sep 2026 04:00:00 +0000

Type	Values Removed	Values Added
Description		A NULL pointer dereference vulnerability in the WatchGuard Fireware OS authentication process allows a remote, unauthenticated attacker to crash the management daemon by sending a specially request to the login interface, resulting in a denial of service.
Title		Fireware OS Pre-Authentication NULL Pointer Dereference Allows Remote Denial of Service
First Time appeared		Watchguard Watchguard fireware Os
Weaknesses		CWE-476
CPEs		cpe:2.3:a:watchguard:fireware_os::::::::
Vendors & Products		Watchguard Watchguard fireware Os
References		https://psirt.watchguard.com/CVE-2026-86134
Metrics		cvssV4_0 `{'score': 8.7, 'vector': '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'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: WatchGuard

Published: 2026-09-30T03:37:57.268Z

Updated: 2026-09-30T03:37:57.268Z

Reserved: 2026-09-05T03:10:50.777Z

Link: CVE-2026-86134

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-30T04:18:33.337

Modified: 2026-09-30T04:18:33.337

Link: CVE-2026-86134

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-476

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