QNAP QTS Format String Vulnerability v5.2.6.3195 Remote Exploit
CVE-2025-53407 Published on October 3, 2025
QTS, QuTS hero
A use of externally-controlled format string vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to obtain secret data or modify memory.
We have already fixed the vulnerability in the following versions:
QTS 5.2.6.3195 build 20250715 and later
QuTS hero h5.2.6.3195 build 20250715 and later
Vulnerability Analysis
CVE-2025-53407 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Use of Externally-Controlled Format String
The software uses a function that accepts a format string as an argument, but the format string originates from an external source.
Products Associated with CVE-2025-53407
stack.watch emails you whenever new vulnerabilities are published in QNAP Qts or QNAP Quts Hero. Just hit a watch button to start following.
Affected Versions
QNAP Systems Inc. QTS:- Version 5.2.x and below 5.2.6.3195 build 20250715 is affected.
- Version h5.2.x and below h5.2.6.3195 build 20250715 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.