QNAP QTS and QuTS hero Buffer Overflow Vulnerability Allowing Memory Modification or Process Crashes

Vulnerability

A buffer overflow vulnerability has been identified in multiple versions of QNAP's operating systems, specifically QTS 5.2.x and QuTS hero h5.2.x and h5.3.x. This vulnerability allows remote attackers with administrator access to exploit the issue, potentially leading to unauthorized memory modification or process crashes.

Impact

Exploitation of this vulnerability could result in unauthorized memory modification or process crashes, disrupting normal system operations.

Remediation

Users can update to QTS 5.2.7.3256 build 20250913 or later, or QuTS hero h5.2.7.3256 build 20250913 or h5.3.1.3250 build 20250912 or later. Instructions for updating QTS or QuTS hero are available on the QNAP website.

Added: Jan 2, 2026, 3:22 PM
Updated: Jan 2, 2026, 5:02 PM

Vulnerability Rating

Custom Algorithm
spread
6.8
impact
1.3
exploitability
4.4
remediation
7.7
relevance
1.8
threat
0.0
urgency
2.9
incentive
1.7

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