CVE-2024-21899 (GCVE-0-2024-21899)
Vulnerability from cvelistv5 – Published: 2024-03-08 16:17 – Updated: 2024-08-01 22:35Title
QTS, QuTS hero, QuTScloud
Summary
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
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-12 04:00 UTC
CWE
Assigner
References
1 reference
Impacted products
8 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| QNAP Systems Inc. | QTS |
Affected:
5.1.x , < 5.1.3.2578 build 20231110
(custom)
Affected: 4.5.x , < 4.5.4.2627 build 20231225 (custom) |
guessed | |
| QNAP Systems Inc. | QuTS hero |
Affected:
h5.1.x , < h5.1.3.2578 build 20231110
(custom)
Affected: h4.5.x , < h4.5.4.2626 build 20231225 (custom) |
guessed | |
| QNAP Systems Inc. | QuTScloud |
Affected:
c5.x.x , < c5.1.5.2651
(custom)
|
guessed | |
| qnap | qts |
Affected:
5.1.0 , < 5.1.3.2578 build 20231110
(custom)
cpe:2.3:o:qnap:qts:5.1.0:*:*:*:*:*:*:* |
||
| qnap | qts |
Affected:
4.5.0 , < 4.5.4.2627 build 20231225
(custom)
cpe:2.3:a:qnap:qts:4.5.0:*:*:*:*:*:*:* |
||
| qnap | quts_hero |
Affected:
h5.1.0 , < h5.1.3.2578 build 20231110
(custom)
cpe:2.3:o:qnap:quts_hero:h5.1.0:*:*:*:*:*:*:* |
||
| qnap | quts_hero |
Affected:
h4.5.0 , < h4.5.4.2626 build 20231225
(custom)
cpe:2.3:o:qnap:quts_hero:h4.5.0:*:*:*:*:*:*:* |
||
| qnap | qutscloud |
Affected:
c5.0.0 , < c5.1.5.2651
(custom)
cpe:2.3:o:qnap:qutscloud:c5.0.0:*:*:*:*:*:*:* |
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c100bd6f-b9a1-445c-ac96-887b09424d54
Exploited: Yes
Characteristics
Severity:
98.0
Timestamps
First Seen: 2024-03-18
Asserted: 2024-03-18
Last Seen: 2026-08-14
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: QNAP / QNAP QTS and QuTS Hero | Class: nas | Severity: Critical (CVSS 9.8) | IoT: yes | In CISA KEV: no | Honeypot connections on 2026-08-14: 9823
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 70%
Source: shadowserver
Details
| 1D | 14 |
|---|---|
| Iot | yes |
| Feed | Shadowserver Foundation honeypot/exploited-vulnerabilities |
| Type | http-scan |
| Class | nas |
| 7D Avg | 2 |
| Vendor | QNAP |
| 30D Avg | 0 |
| 90D Avg | 0 |
| Product | QNAP QTS and QuTS Hero |
| Cisa Kev | no |
| Connections | 9823 |
| Observation Date | 2026-08-14 |
| Vulnerability Class | CVSS |
| Vulnerability Score | 9.8 |
| Vulnerability Severity | Critical |
References
Created: 2026-07-01 07:17 UTC
| Updated: 2026-08-16 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 61730370-f773-45b7-af0b-54a01a385375
Exploited: Yes
Timestamps
First Seen: 2025-04-27
Asserted: 2025-04-27
Scope
Notes: KEVIntel entry: QTS, QuTS hero, QuTScloud | Affected: QNAP Systems Inc. / QTS, QuTS hero, QuTScloud | CVSS: 9.8 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | QTS, QuTS hero, QuTScloud |
| Vendor | QNAP Systems Inc. |
| Product | QTS, QuTS hero, QuTScloud |
| Added Date | 2025-04-27T00:00:00.000Z |
| Cvss Score | 9.8 |
| Epss Score | None |
| Cvss Severity | CRITICAL |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | True |
References
Created: 2026-06-23 11:13 UTC
| Updated: 2026-06-23 11:13 UTC
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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