NULL Pointer Dereference Vulnerability in QNAP Operating Systems
CVE-2025-53405

1.2LOW

Key Information:

Vendor

QNAP
Status
Qts
Quts Hero
Vendor
CVE Published:
2 January 2026

What is CVE-2025-53405?

A NULL pointer dereference vulnerability has been identified in multiple versions of QNAP operating systems, allowing a remote attacker with administrative access to leverage this flaw. The exploitation of this vulnerability can lead to a denial-of-service (DoS) attack, disrupting normal operations and service availability. Users are strongly advised to upgrade to the fixed versions to mitigate potential risks. The affected versions include specific builds of QTS and QuTS hero operating systems.

Affected Version(s)

QTS 5.2.x < 5.2.7.3256 build 20250913

QuTS hero h5.2.x

QuTS hero h5.3.x

References

https://www.qnap.com/en/security-advisory/qsa-25-50

CVSS V4

Score:
1.2
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

coral
.