How severe is CVE-2024-21905?

CVE-2024-21905 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2024-21905 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21905?

CVE-2024-21905 primarily affects Qnap Qts. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-21905?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-21905 have an EU (EUVD) identifier?

Yes. CVE-2024-21905 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19516.

When was CVE-2024-21905 published?

CVE-2024-21905 was published on 2024-04-26 and last updated on 2026-06-17.

CVE-2024-21905

CVE-2024-21905 is a medium-severity vulnerability in Qnap Qts with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19516
Weakness: CWE-190
Affected product: Qnap Qts
Published: 2024-04-26
Last modified: 2026-06-17

Description

An integer overflow or wraparound vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to compromise the security of the system via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.3.2578 build 20231110 and later QuTS hero h5.1.3.2578 build 20231110 and later QuTScloud c5.1.5.2651 and later

Frequently asked questions

What is CVE-2024-21905?: An integer overflow or wraparound vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to compromise the security of the system via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.3.2578 build 20231110 and later QuTS hero h5.1.3.2578 build 20231110 and later QuTScloud c5.1.5.2651 and later
How severe is CVE-2024-21905?: CVE-2024-21905 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2024-21905 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21905?: CVE-2024-21905 primarily affects Qnap Qts. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-21905?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-21905 have an EU (EUVD) identifier?: Yes. CVE-2024-21905 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19516.
When was CVE-2024-21905 published?: CVE-2024-21905 was published on 2024-04-26 and last updated on 2026-06-17.

References

https://www.qnap.com/en/security-advisory/qsa-24-16

Affected products (5)

cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.3.2578:-:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.3.2578:-:*:*:*:*:*:*
cpe:2.3:o:qnap:qutscloud:*:*:*:*:*:*:*:*

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