QNAP QuTS hero OS <=5.3.2.3354 NULL Pointer DoS
CVE-2025-66274 Published on February 11, 2026
QuTS hero
A NULL pointer dereference 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 launch a denial-of-service (DoS) attack.
We have already fixed the vulnerability in the following version:
QuTS hero h5.3.2.3354 build 20251225 and later
Weakness Type
NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.
Products Associated with CVE-2025-66274
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Affected Versions
QNAP Systems Inc. QuTS hero:- Version ? and below h5.3.2.3354 build 20251225 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.