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.

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

EPSS: 0.064 (93.0th percentile) — read the EPSS interpretation.

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.

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

5d1c2695-1a31-4499-88ae-e847036fd7e3 (Vendor Advisory)

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.