Buffer overflow in QNAP Qsync Central
CVE-2025-52868
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 version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (21.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- QNAP Qsync Central
- QNAP Systems Inc. Qsync Central — versions 5.0.x.x
Weakness classification (CWE)
References
- www.qnap.com/en/security-advisory/qsa-26-02 (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-52868?
- CVE-2025-52868 is a high-severity vulnerability in QNAP Qsync Central, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.1/10. Published 2026-02-11.
- How severe is CVE-2025-52868?
- High severity. CVSS v3 base score is 8.1 out of 10.