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Qsync Central Out-of-Bounds Read Vulnerability Allowing Data Exposure

Vulnerability

An out-of-bounds read vulnerability has been identified in Qsync Central versions 5.0.x. This vulnerability allows remote attackers with user account access to exploit the issue and obtain secret data. The vulnerability has been fixed in Qsync Central version 5.0.0.4, released on January 20, 2026.

Impact

Exploitation of this vulnerability could lead to unauthorized access to sensitive data.

Remediation

Users are advised to update Qsync Central to version 5.0.0.4 or later. Instructions for updating Qsync Central are available on the QNAP website.

Added: Feb 11, 2026, 1:26 PM
Updated: Feb 11, 2026, 5:15 PM

Vulnerability Rating

Custom Algorithm
spread
6.2
impact
2.5
exploitability
6.6
remediation
7.7
relevance
2.9
threat
0.0
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.