Link Following Vulnerability in QNAP Operating Systems
CVE-2025-66277

9.2CRITICAL

Key Information:

Vendor

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

What is CVE-2025-66277?

A link following vulnerability has been identified in several versions of QNAP operating systems, allowing remote attackers to traverse the file system and access unintended locations. This exploitation could lead to unauthorized data exposure or modification, emphasizing the necessity for timely updates and security measures. QNAP has implemented fixes for this issue in subsequent builds, ensuring enhanced protection against such vulnerabilities.

Affected Version(s)

QTS 5.2.x < 5.2.8.3350 build 20251216

QuTS hero h5.3.x

QuTS hero h5.2.x

References

https://www.qnap.com/en/security-advisory/qsa-26-05

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

coral
.