Main Vulnerability Database Vulnerabilities #VU122753

Link following in QuTS hero and QNAP QTS - CVE-2025-66277

Published: February 12, 2026

Vulnerability identifier: #VU122753

CSH Severity: High

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-66277

CWE-ID: CWE-59

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to an insecure link following issue. A remote attacker can create a specially crafted symbolic link to a critical file on the system and overwrite it with privileges of the application.

Affected software

QuTS hero
QNAP QTS

How to mitigate CVE-2025-66277

Install updates from vendor's website.

QuTS hero - update to h5.2.8.3350 build 20251216
QNAP QTS - update to 5.2.8.3350 20251216

External References

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

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