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CVE-2026-18105

Fireware OS Uncontrolled Resource Consumption in Diagnostic Tasks Allows Denial of Service

WatchGuard Fireware OSNetwork & edge
Open in ThreatlineRecord JSON
CVSS
7.1High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in2026.3.2Also 2026.2.3, 12.12.3 and 1 moreCVE List
Published29 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 4

  • Fireware OSaffected: 2026.3 before 2026.3.2CVE List
  • Fireware OSaffected: 2025.0 before 2026.2.3CVE List
  • Fireware OSaffected: 12.0 before 12.12.3CVE List
  • Fireware OSaffected: 12.0 before 12.5.21CVE List

References 1