What is CVE-2026-3344?

CVE-2026-3344 is a medium-severity vulnerability in Watchguard Fireboxcloud, classified under Expected Behavior Violation. CVSS score: 4.9/10. Published 2026-03-03.

How severe is CVE-2026-3344?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Watchguard Fireboxcloud

CVE-2026-3344

A vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS filesystem integrity check and maintain limited persistence via a maliciously-crafted firmware update package.

Published 2026-03-03 · last modified 2026-08-10.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (35.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-440 — Expected Behavior Violation

References

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

Frequently asked questions

What is CVE-2026-3344?: CVE-2026-3344 is a medium-severity vulnerability in Watchguard Fireboxcloud, classified under Expected Behavior Violation. CVSS score: 4.9/10. Published 2026-03-03.
How severe is CVE-2026-3344?: Medium severity. CVSS v3 base score is 4.9 out of 10.