CVE-2026-18105

Analyzed Analyzed - Analysis Complete

Uncontrolled Resource Consumption in Fireware OS Diagnostic Tasks

Publication date: 2026-09-30

Last updated on: 2026-10-08

Assigner: WatchGuard Technologies, Inc.

Description

An uncontrolled resource consumption vulnerability in Fireware OS's diagnostic tasks feature allows a low-privileged, authenticated user to cause a denial of service of the system's diagnostic tools by repeatedly starting and aborting a specially crafted diagnostic task through the web UI.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-30

Last Modified

2026-10-08

Generated

2026-10-19

AI Q&A

2026-09-30

EPSS Evaluated

2026-10-18

NVD

CVE-2026-18105

EUVD

EUVD-2026-89493

Affected Vendors & Products

Vendor	Product	Version / Range
watchguard	fireware	From 12.0 (inc) to 12.5.21 (exc)
watchguard	fireware	From 12.12 (inc) to 12.12.3 (exc)
watchguard	fireware	From 2026.3 (inc) to 2026.3.2 (exc)
watchguard	fireware	From 2025.0 (inc) to 2026.2.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-770	The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This vulnerability is an uncontrolled resource consumption issue in Fireware OS's diagnostic tasks feature. A low-privileged, authenticated user can repeatedly start and abort a specially crafted diagnostic task through the web UI, causing a denial of service for the system's diagnostic tools.

Detection Guidance

Monitor for unusual diagnostic task activity in Fireware OS logs. Check for repeated start/abort cycles of diagnostic tasks via the web UI. Inspect system resource usage for spikes during diagnostic operations.

Impact Analysis

This vulnerability can cause the diagnostic tools on your Fireware OS system to become unavailable, disrupting troubleshooting and monitoring capabilities. It may lead to system instability or reduced performance during an attack.

Compliance Impact

This vulnerability could indirectly impact compliance with standards like GDPR or HIPAA by disrupting the availability of diagnostic tools used for monitoring and maintaining system security and data integrity. A denial of service on diagnostic tools may hinder incident response and auditing capabilities, which are critical for compliance.

Mitigation Strategies

Upgrade Fireware OS to versions 2026.3.2, 2026.2.3, 12.12.3, or 12.5.21. Restrict user access to diagnostic tools to prevent unauthorized task initiation. Monitor network traffic for suspicious activity targeting diagnostic features.

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