CVE-2024-21899
High PUBLISHEDQTS, QuTS hero, QuTScloud
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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
- CVE Published
- Mar 08, 2024
- Exploitation Reported
- Apr 27, 2025
- CVSS
- 9.8 Critical
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| qnap |
qts
|
5.1.0 to < 5.1.3.2578 build 20231110 |
Affected |
| qnap |
qts
|
4.5.0 to < 4.5.4.2627 build 20231225 |
Affected |
| qnap |
quts_hero
|
h5.1.0 to < h5.1.3.2578 build 20231110 |
Affected |
| qnap |
quts_hero
|
h4.5.0 to < h4.5.4.2626 build 20231225 |
Affected |
| qnap |
qutscloud
|
c5.0.0 to < c5.1.5.2651 |
Affected |
| QNAP Systems Inc. |
QTS
|
5.1.x to < 5.1.3.2578 build 20231110 |
Affected |
| QNAP Systems Inc. |
QTS
|
4.5.x to < 4.5.4.2627 build 20231225 |
Affected |
| QNAP Systems Inc. |
QuTS hero
|
h5.1.x to < h5.1.3.2578 build 20231110 |
Affected |
| QNAP Systems Inc. |
QuTS hero
|
h4.5.x to < h4.5.4.2626 build 20231225 |
Affected |
| QNAP Systems Inc. |
QuTScloud
|
c5.x.x to < c5.1.5.2651 |
Affected |
CVE References
- qnap.com/en/security-advisory/qsa-24-09 qnap.com · CVE Record https://www.qnap.com/en/security-advisory/qsa-24-09
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2025-04-27 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2025-04-27 00:00:00 UTC · The Shadowserver
Weaknesses (CWE)
-
Improper Authentication
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
16:17 UTC over 2 years ago16:17 UTC · over 2 years ago
CVE published
Vulnerability disclosed publicly
-
02:31 UTC over 2 years ago02:31 UTC · over 2 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2024-21899
{
"cve_id": "CVE-2024-21899",
"title": "QTS, QuTS hero, QuTScloud",
"affected_vendor": "QNAP Systems Inc.",
"affected_product": "QTS, QuTS hero, QuTScloud",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 9.8,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}