CVE-2025-66274
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 versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.2.3354 build 20251225 and later QuTS hero h6.0.0.3397 build 20260206 and later
Published:Feb 11, 2026
Last Modified:Jun 9, 2026
EPS:Feb 11, 2026
EPSS Score:0.00145
CVSS Score:4.9
Affected Products
Vendor
Product
Action
Vendor
Qnap
Product
Quts Hero
Qnap
Quts Hero
Vendor
Qnap Systems
Product
Quts Hero
Qnap Systems
Quts Hero
Exploits
No exploit reference
Common Weakness Enumeration
Common Attack Pattern Enumeration and Classification (CAPEC)
No CAPEC recorded yet
Related CVEs
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
