CVE-2025-66281

A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later

Score

CVSS 3.1 7.2 High

Status

Analyzed - security@qnapsecurity.com.tw

Published

2026-06-10

Last modified

2026-06-10

Weaknesses

CWE-476

Affected products

• Qts (Qnap)
• Quts Hero (Qnap)
• Qts (Qnap Systems Inc.)
• Quts Hero (Qnap Systems Inc.)

References

• https://www.qnap.com/en/security-advisory/qsa-26-10