Is CVE-2026-18105 being actively exploited?

CVE-2026-18105 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-18105?

CVE-2026-18105 has a CVSS 3.1 base score of 6.5 (MEDIUM).

CVE-2026-18105

MEDIUM · CVSS 6.5EPSS 0.2%EU EUVD

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.

Key facts

CVSS score: 6.5 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
EPSS score: 0.2% (14th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-89493)
Published: September 30, 2026
NVD last modified: October 8, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-89493 in the EU Vulnerability Database. Last updated in EUVD on September 30, 2026.

View on the EU Vulnerability Database

Affected products

watchguard / fireware

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

WatchGuard Fireware OS v12.3.1.B585922 (Running on Firebox Security Appliances) with WatchGuard Dimension 2.1.2.B588050 Software - WatchGuard Technologies Inc. - Common Criteria 2018-26-INF-3091 - archived

References

https://psirt.watchguard.com/CVE-2026-18105(Patch, Vendor Advisory)

Last updated October 10, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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