NULL Pointer Dereference Vulnerability in QNAP Operating System
CVE-2025-66274

5.1MEDIUM

Key Information:

Vendor

QNAP
Status
Qts
Quts Hero
Vendor
CVE Published:
11 February 2026

What is CVE-2025-66274?

A NULL pointer dereference vulnerability has been identified in multiple versions of the QNAP operating system, allowing an attacker with remote administrative access to exploit the flaw. This exploitation can lead to a denial-of-service (DoS) condition, potentially compromising system availability. Users are advised to upgrade to QuTS hero version h5.3.2.3354 build 20251225 or later to mitigate this risk effectively.

Affected Version(s)

QTS 5.2.0 < 5.2.9.3410 build 20260214

QuTS hero h5.2.0

QuTS hero h5.3.0

References

https://www.qnap.com/en/security-advisory/qsa-26-08

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

coral
.