CVE-2025-66274

QTS, QuTS hero

State: Published
Severity: 5.1 Medium
Published: Feb 11, 2026
Updated: Jun 9, 2026
Reserved: Nov 26, 2025

Description

A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they 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 h5.3.2.3354 build 20251225 and later QuTS hero h6.0.0.3397 build 20260206 and later

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N	qnap

Weaknesses

CWE-476

Affected Products

Product	Versions
QTSQNAP Systems Inc.	5.2.0 to before 5.2.9.3410 build 20260214Affected
QuTS heroQNAP Systems Inc.	h5.2.0 to before h5.2.9.3410 build 20260214Affected h5.3.0 to before h5.3.2.3354 build 20251225Affected ? to before h6.0.0.3397 build 20260206Affected

References

https://www.qnap.com/en/security-advisory/qsa-26-08

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