VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 9.8 criticalEPSS 24.4% probability of exploitation in 30 days
QNAP

CVE-2024-21899: QTS, QuTS hero, QuTScloud

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 70 public reports, the first from .

How likely is exploitation in the next 30 days?
24.4%

EPSS score, percentile 97.9 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
9.8 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

We have already fixed the vulnerability in the following versions: QTS 5.1.3.2578 build 20231110 and later QTS 4.5.4.2627 build 20231225 and later QuTS hero h5.1.3.2578 … Full textSolution from the CVE record.

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • from 5.1.x to before 5.1.3.2578 build 20231110
  • from 4.5.x to before 4.5.4.2627 build 20231225
  • from h5.1.x to before h5.1.3.2578 build 20231110
  • from h4.5.x to before h4.5.4.2626 build 20231225
  • from c5.x.x to before c5.1.5.2651

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

QTS, QuTS hero, QuTScloud

An improper authentication 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 QTS 4.5.4.2627 build 20231225 and later QuTS hero h5.1.3.2578 build 20231110 and later QuTS hero h4.5.4.2626 build 20231225 and later QuTScloud c5.1.5.2651 and later

Source: CVE List, as of . About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Solution (from the CVE record)

We have already fixed the vulnerability in the following versions: QTS 5.1.3.2578 build 20231110 and later QTS 4.5.4.2627 build 20231225 and later QuTS hero h5.1.3.2578 build 20231110 and later QuTS hero h4.5.4.2626 build 20231225 and later QuTScloud c5.1.5.2651 and later

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (3 products)
QNAP Systems Inc. QTS
StatusVersions
Affectedfrom 5.1.x to before 5.1.3.2578 build 20231110
Affectedfrom 4.5.x to before 4.5.4.2627 build 20231225

Versions not listed are: unaffected.

QNAP Systems Inc. QuTS hero
StatusVersions
Affectedfrom h5.1.x to before h5.1.3.2578 build 20231110
Affectedfrom h4.5.x to before h4.5.4.2626 build 20231225

Versions not listed are: unaffected.

QNAP Systems Inc. QuTScloud
StatusVersions
Affectedfrom c5.x.x to before c5.1.5.2651

Versions not listed are: unaffected.

Source: CVE List, as of . About the data.

Weakness

CWE-287, 1 CAPEC

Attack patterns (CAPEC)

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

1

Known exploited QNAP vulnerabilities

  • CVE-2023-47565: QNAP VioStor NVR OS Command Injection Vulnerability (added )
  • CVE-2022-27593: QNAP Photo Station Externally Controlled Reference Vulnerability (added )
  • CVE-2019-7192: QNAP Photo Station Improper Access Control Vulnerability (added )
  • CVE-2019-7193: QNAP QTS Improper Input Validation Vulnerability (added )
  • CVE-2019-7194: QNAP Photo Station Path Traversal Vulnerability (added )