Raw vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XSummary
CVE-2024-50395 is a medium-severity Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability in Qnap Media Streaming Add-On. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 32% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to AC-24 (Access Control Decisions) and AC-3 (Access Enforcement) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
An authorization bypass through user-controlled key vulnerability, tracked as CWE-639, affects the Media Streaming add-on for QNAP devices. The flaw permits an attacker to manipulate keys under their control to circumvent authorization checks, and it was assigned a CVSS 4.0 score of 6.9.
Local network attackers can exploit the issue without prior authentication or user interaction beyond the initial request, enabling them to elevate privileges on the affected system. Successful exploitation grants unauthorized access to resources that should be protected by the add-on's authorization logic.
QNAP's security advisory QSA-24-47 confirms the vulnerability is resolved in Media Streaming add-on version 500.1.1.6 released on 2024/08/02 and all subsequent builds; users are advised to update immediately. The associated EPSS score rose from lower values to a peak of 0.1544 on 2025-12-11 before receding, indicating increased exploitation interest after public disclosure.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-45076
Vulnerability Data
An authorization bypass through user-controlled key vulnerability has been reported to affect Media Streaming add-on. If exploited, the vulnerability could allow local network attackers to gain privilege. We have already fixed the vulnerability in the following version: Media Streaming add-on…
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500.1.1.6 ( 2024/08/02 ) and later
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Enforcing approved authorizations on every access request structurally stops a user-controlled key from reaching another user's data.
Requiring explicit access-control decisions on each request blocks unauthorized key-driven access.
Least-privilege restrictions limit the scope of data reachable even if a key check is bypassed.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Enforcing authorization policy and least privilege directly blocks user-controlled key tampering that bypasses access checks.
Logical access controls prevent unauthorized data access that results from missing authorization checks on object references.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can detect missing authorization checks but does not prevent the weakness in production.
Information access restriction explicitly enforces that users may only retrieve data they are authorized to see, directly addressing user-controlled key bypass.
Access control policy directly requires enforcement of authorization rules that prevent unauthorized access via manipulated keys.
Managing access rights includes ensuring users can only access their own records and not bypass authorization by altering identifiers.
Privileged access rights control restricts what data each user may access, mitigating direct object reference attacks.
Secure development lifecycle includes authorization design but does not itself implement runtime access checks.