Qsync Central OOB Write Before v5.0.0.4 Remote Account Exploit
CVE-2025-30276 Published on February 11, 2026
Qsync Central
An out-of-bounds write vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify or corrupt memory.
We have already fixed the vulnerability in the following version:
Qsync Central 5.0.0.4 ( 2026/01/20 ) and later
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2025-30276 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2025-30276
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Affected Versions
QNAP Systems Inc. Qsync Central:- Version 5.0.x.x and below 5.0.0.4 ( 2026/01/20 ) is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.