Integer Overflow Vulnerability in QNAP Operating Systems
CVE-2025-66280

5.1MEDIUM

Key Information:

Vendor

QNAP
Status
Qts
Quts Hero
Vendor
CVE Published:
10 June 2026

What is CVE-2025-66280?

An integer overflow vulnerability has been identified in several versions of QNAP's operating systems, posing a significant risk to system integrity. If exploited by an attacker with remote access and administrator privileges, this vulnerability could allow unauthorized manipulation of system data and ultimately compromise the security of the affected devices. Users are urged to update their systems to protected versions to mitigate this risk.

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-26-10

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

Bechir Bouali (@b3ch1r) from SecLab - TII
.