CVE-2023-23356: A command injection vulnerability has been reported to affect several QNAP operating system versions

Q: How do I fix CVE-2023-23356?

qufirewall: upgrade to 2.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2023-23356 being exploited?

CVE-2023-23356 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-23356 affect?

CVE-2023-23356 affects qufirewall. Severity is medium (CVSS 5.5). 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

Q: How urgent is CVE-2023-23356?

Priority 34/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2023-23356 is a medium-severity flaw (CVSS 5.5) affecting qufirewall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-77, CWE-78
Published	2024-12-19
Last modified	2026-06-17

Publisher (CNA): QNAP Systems, Inc. · Vendor: qnap

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-12-19 02:15 UTCPublished CVE record published
2026-06-17 05:36 UTCUpdated Record last modified

qnap qufirewall UPGRADE

Affected: < 2.3.3

Fixed in: 2.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy qufirewall || rpm -q qufirewall || qufirewall --version

2. UPGRADE to 2.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade qufirewall

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade qufirewall

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-23356?

qufirewall: upgrade to 2.3.3. Exact commands for each OS are on this page.

Is CVE-2023-23356 being exploited?

CVE-2023-23356 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-23356 affect?

CVE-2023-23356 affects qufirewall. Severity is medium (CVSS 5.5). 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

How urgent is CVE-2023-23356?

Priority 34/100. No elevated risk signals yet.

Software pages

QNAP vulnerabilities

Related CVEs

CVE-2023-41291 MEDIUM 5.5 UPGRADE A path traversal vulnerability has been reported to affect QuFirewall
CVE-2023-41290 MEDIUM 4.1 DOWNGRADE A path traversal vulnerability has been reported to affect QuFirewall

References

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