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.
Published: 2026-09-30
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

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

Tracking

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Advisories

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History

Tue, 06 Oct 2026 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Watchguard fireware
CPEs cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
Vendors & Products Watchguard fireware
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Wed, 30 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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
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'}


Subscriptions

Watchguard Fireware Fireware Os
cve-icon MITRE

Status: PUBLISHED

Assigner: WatchGuard

Published:

Updated: 2026-09-30T14:38:30.274Z

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

Link: CVE-2026-86134

cve-icon Vulnrichment

Updated: 2026-09-30T14:38:27.156Z

cve-icon NVD

Status : Analyzed

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

Modified: 2026-10-06T17:30:29.910

Link: CVE-2026-86134

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T09:00:07Z

Weaknesses