QNAP QTS/QuTS Hero: Link Following Path Traversal (pre-5.2.8/5.3.2)
CVE-2025-66277 Published on February 11, 2026
QTS, QuTS hero
A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations.
We have already fixed the vulnerability in the following versions:
QTS 5.2.8.3350 build 20251216 and later
QuTS hero h5.3.2.3354 build 20251225 and later
QuTS hero h5.2.8.3350 build 20251216 and later
Weakness Type
What is an insecure temporary file Vulnerability?
The software attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2025-66277 has been classified to as an insecure temporary file vulnerability or weakness.
Products Associated with CVE-2025-66277
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Affected Versions
QNAP Systems Inc. QTS:- Version 5.2.x and below 5.2.8.3350 build 20251216 is affected.
- Version h5.3.x and below h5.3.2.3354 build 20251225 is affected.
- Version h5.2.x and below h5.2.8.3350 build 20251216 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.