What is CVE-2023-23356?

CVE-2023-23356 is a medium-severity vulnerability in QNAP Qufirewall, classified under Command Injection. CVSS score: 5.5/10. Published 2024-12-19.

How severe is CVE-2023-23356?

Medium severity. CVSS v3 base score is 5.5 out of 10.

RCE in QNAP Qufirewall

CVE-2023-23356

A command injection vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow remote attackers who have gained administrator access to execute arbitrary commands. We have already fixed the vulnerability in the following versions: QuFirewall 2.3.3 ( 2023/03/27 ) and later and later

Vulnerability class: Command Injection (OS Command Injection)

Published 2024-12-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.5% 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: 0.009 · change: +0.002

Affected products

QNAP Qufirewall
QNAP Systems Inc. Qufirewall — versions 2.3.x

Weakness classification (CWE)

References

www.qnap.com/en/security-advisory/qsa-23-14 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-23356?: CVE-2023-23356 is a medium-severity vulnerability in QNAP Qufirewall, classified under Command Injection. CVSS score: 5.5/10. Published 2024-12-19.
How severe is CVE-2023-23356?: Medium severity. CVSS v3 base score is 5.5 out of 10.