CVE-2024-21899

CRITICAL

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 syst...

Affects 3 products across 1 vendor.

BCS7.75
CVSS 3.19.8
EPSS24.4%
Percentile98th
PatchPatched
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-287: Improper Authentication

Software does not prove or insufficiently proves that the user is who they claim to be.

Related Attack Patterns (CAPEC)
CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
via CWE-287
CAPEC-633 Token Impersonation
via CWE-287
CAPEC-650 Upload a Web Shell to a Web Server
via CWE-287
CAPEC-194 Fake the Source of Data
via CWE-287
CAPEC-593 Session Hijacking
via CWE-287
Show all 10

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ SAGE Intelligence — CITED Relevance Research Team

An improper authentication vulnerability in QNAP operating systems could allow unauthorized access to the system via a network.

BSID: BS-2024-GLOBAL-051428-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2024-21899?
An improper authentication vulnerability in QNAP operating systems could allow unauthorized access to the system via a network.
What is the CVSS score for CVE-2024-21899?
CVE-2024-21899 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 24.4%.
Is CVE-2024-21899 actively exploited?
No confirmed active exploitation of CVE-2024-21899 as of 2026-05-30.
How do I remediate CVE-2024-21899?
Priority: IMMEDIATE. Advisory: https://www.qnap.com/en/security-advisory/qsa-24-09 PSIRT: [email protected]
What systems are affected by CVE-2024-21899?
CVE-2024-21899 affects: Qnap, Qnap, Qnap.
Vulnerability Details
CVE IDCVE-2024-21899
BSIDBS-2024-GLOBAL-051428-C BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2024-03-08
Last Modified2024-11-21
ICS Relevance70%
Weakness (CWE)
Improper Authentication
SourceNVD
Official Description

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: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability is related to improper authentication mechanisms, which could be exploited by an attacker to gain unauthorized access to the system.

Exploitation Likelihood: HIGH

Affected Products
VendorProductFixed Version
Qnap Qts —
Qnap Quts Hero —
Qnap Qutscloud —
Remediation
View Vendor Advisory →

Remediation Priority: IMMEDIATE

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: July 2026 | Threat Age: 869 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
SHA-512 Audit Hash685ef5a69d94dd79bf6f0e7d0c54d7460bc362b4ddf1d4bd353a69566909a209aea4b0e7d16784d701e10313407c160e219d083bf0e8ac66ee31a981505a7b32
Related CVEs affecting Qnap
CVE-2017-7876 10.0 This command injection vulnerability in QTS allows attackers to run arbitrary... CVE-2024-32766 10.0 An OS command injection vulnerability has been reported to affect several QNA... CVE-2024-32764 9.9 A missing authentication for critical function vulnerability has been reporte... CVE-2017-13071 9.8 QNAP has already patched this vulnerability. This security concern allows a r... CVE-2021-38687 9.8 A stack buffer overflow vulnerability has been reported to affect QNAP NAS ru...
View all Qnap CVEs →

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