How severe is CVE-2024-21897?

CVE-2024-21897 has a CVSS 3.x base score of 8.9, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2024-21897 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21897?

CVE-2024-21897 primarily affects Qnap Qts. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-21897?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-21897 have an EU (EUVD) identifier?

Yes. CVE-2024-21897 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19508.

When was CVE-2024-21897 published?

CVE-2024-21897 was published on 2024-09-06 and last updated on 2026-06-17.

CVE-2024-21897

CVE-2024-21897 is a high-severity vulnerability in Qnap Qts with a CVSS 3.x base score of 8.9. 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-79.

Key facts

Severity: High (CVSS 3.x base score 8.9)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19508
Weakness: CWE-79
Affected product: Qnap Qts
Published: 2024-09-06
Last modified: 2026-06-17

Description

A cross-site scripting (XSS) vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow authenticated users to inject malicious code via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.6.2722 build 20240402 and later QuTS hero h5.1.6.2734 build 20240414 and later

Frequently asked questions

What is CVE-2024-21897?: A cross-site scripting (XSS) vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow authenticated users to inject malicious code via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.6.2722 build 20240402 and later QuTS hero h5.1.6.2734 build 20240414 and later
How severe is CVE-2024-21897?: CVE-2024-21897 has a CVSS 3.x base score of 8.9, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2024-21897 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21897?: CVE-2024-21897 primarily affects Qnap Qts. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-21897?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-21897 have an EU (EUVD) identifier?: Yes. CVE-2024-21897 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19508.
When was CVE-2024-21897 published?: CVE-2024-21897 was published on 2024-09-06 and last updated on 2026-06-17.

References

https://www.qnap.com/en/security-advisory/qsa-24-20

Affected products (21)

cpe:2.3:o:qnap:qts:5.1.0.2348:build_20230325:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.0.2399:build_20230515:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.0.2418:build_20230603:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.0.2444:build_20230629:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.0.2466:build_20230721:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.1.2491:build_20230815:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.2.2533:build_20230926:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.3.2578:build_20231110:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.4.2596:build_20231128:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.5.2645:build_20240116:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:5.1.5.2679:build_20240219:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.0.2409:build_20230525:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.0.2424:build_20230609:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.0.2453:build_20230708:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.0.2466:build_20230721:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.1.2488:build_20230812:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.2.2534:build_20230927:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.3.2578:build_20231110:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.4.2596:build_20231128:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.5.2647:build_20240118:*:*:*:*:*:*
cpe:2.3:o:qnap:quts_hero:h5.1.5.2680:build_20240220:*:*:*:*:*:*

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