Buffer overflow in Watchguard Fireboxcloud

CVE-2026-3342

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an authenticated privileged administrator to execute arbitrary code with root permissions via an exposed management interface. This vulnerability affects Fireware OS 11.9 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-3342: fell from 0.064 to 0.007.

EPSS over last 30 days · oldest: 0.064 · newest: 0.007 · change: -0.057

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-3342?
CVE-2026-3342 is a high-severity vulnerability in Watchguard Fireboxcloud, classified under Out-of-bounds Write. CVSS score: 7.2/10. Published 2026-03-03.
How severe is CVE-2026-3342?
High severity. CVSS v3 base score is 7.2 out of 10.