CVE-2025-52869
Published: 11 February 2026
Description
A buffer overflow vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following…
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version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later
Mitigating Controls (NIST 800-53 r5)AI
SI-2 requires timely flaw remediation, directly mitigating this buffer overflow by applying the vendor-provided patch to Qsync Central version 5.0.0.4 or later.
SI-10 enforces information input validation, preventing buffer overflows like CWE-120/122 triggered by attacker-supplied inputs post-authentication.
SI-16 provides memory protection mechanisms such as ASLR and DEP, blocking unauthorized memory modification and process crashes from buffer overflow exploitation.
Security SummaryAI
CVE-2025-52869 is a buffer overflow vulnerability (CWE-120, CWE-122) affecting Qsync Central. Published on 2026-02-11, it carries a CVSS v3.1 base score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H), indicating high severity due to network accessibility, low attack complexity, and impacts on integrity and availability without requiring user interaction or privilege escalation beyond initial user-level access.
A remote attacker who has gained a user account can exploit the vulnerability to modify memory or crash processes, enabling high-impact integrity violations such as unauthorized data alteration and denial-of-service conditions through process termination.
QNAP's security advisory confirms the vulnerability has been fixed in Qsync Central version 5.0.0.4, released on 2026/01/20, and all later versions. Practitioners should update affected systems immediately and consult the advisory at https://www.qnap.com/en/security-advisory/qsa-26-02 for full details on verification and deployment.
Details
- CWE(s)
Affected Products
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The buffer overflow allows remote attackers with user access to crash processes (T1499.004: Endpoint Denial of Service via application exploitation) and perform unauthorized data alteration through memory modification (T1565.001: Stored Data Manipulation), directly matching the described impacts on availability and integrity.