What is CVE-2021-38679?

CVE-2021-38679 is a medium-severity vulnerability in QNAP Kazoo Server, classified under Improper Authentication. CVSS score: 6.5/10. Published 2022-02-11.

How severe is CVE-2021-38679?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in QNAP Kazoo Server

CVE-2021-38679

An improper authentication vulnerability has been reported to affect QNAP NAS running Kazoo Server. If exploited, this vulnerability allows attackers to compromise the security of the system. We have already fixed this vulnerability in the following versions of Kazoo Server: Kazoo Server 4.11.22 and later

Vulnerability class: Broken Authentication

Published 2022-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (53.1th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

QNAP Kazoo Server
QNAP Systems Inc. Kazoo Server — versions unspecified

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.qnap.com/en/security-advisory/qsa-22-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-38679?: CVE-2021-38679 is a medium-severity vulnerability in QNAP Kazoo Server, classified under Improper Authentication. CVSS score: 6.5/10. Published 2022-02-11.
How severe is CVE-2021-38679?: Medium severity. CVSS v3 base score is 6.5 out of 10.