CVE-2025-30277
Published: 29 August 2025
Summary
CVE-2025-30277 is a high-severity Improper Certificate Validation (CWE-295) vulnerability in Qnap Qsync Central. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 30.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-17 (Public Key Infrastructure Certificates) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
SC-17 mandates proper validation of PKI certificates to trusted anchors, directly mitigating the improper certificate validation vulnerability in Qsync Central exploited by remote attackers with user accounts.
SI-2 requires timely flaw remediation including application of vendor patches like Qsync Central 4.5.0.7, preventing exploitation of this high-severity vulnerability.
AC-17 enforces cryptographic protections for remote access transmissions, addressing network-based exploitation reliant on improper certificate validation once a user account is obtained.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Improper certificate validation (CWE-295) in a network-accessible service directly enables exploitation of public-facing apps (T1190) and facilitates adversary-in-the-middle attacks by allowing spoofed or intercepted TLS sessions (T1557).
NVD Description
An improper certificate validation vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to compromise the security of the system. We have already fixed the vulnerability in…
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the following version: Qsync Central 4.5.0.7 ( 2025/04/23 ) and later
Deeper analysisAI
CVE-2025-30277 is an improper certificate validation vulnerability (CWE-295) affecting Qsync Central. Published on 2025-08-29, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to its network accessibility, low attack complexity, and potential for significant impacts on confidentiality, integrity, and availability.
A remote attacker who first gains a user account on the affected system can exploit this vulnerability over the network without user interaction. Successful exploitation allows the attacker to compromise the security of the system, achieving high-level impacts across confidentiality, integrity, and availability as reflected in the CVSS metrics.
QNAP has addressed the vulnerability in Qsync Central version 4.5.0.7, released on 2025/04/23, and all later versions. Additional details on mitigation and affected configurations are available in QNAP security advisory QSA-25-22 at https://www.qnap.com/en/security-advisory/qsa-25-22.
Details
- CWE(s)