Is CVE-2026-18145 being actively exploited?

CVE-2026-18145 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-18145?

CVE-2026-18145 has a CVSS 3.1 base score of 7.2 (HIGH).

CVE-2026-18145

HIGH · CVSS 7.2EPSS 0.4%EU EUVD

A stack-based buffer overflow vulnerability in the spamBlocker (spamd) service of WatchGuard Fireware OS allows an authenticated attacker with administrator privileges to crash the service or potentially execute arbitrary code by sending a specially crafted management request.

Key facts

CVSS score: 7.2 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-121
EPSS score: 0.4% (31th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-89500)
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-2026-89500 in the EU Vulnerability Database. Last updated in EUVD on October 1, 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-2026-18145(Patch, Vendor Advisory)

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

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