CVE-2025-66274: QNAP Quts Hero

Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days.

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

Affected products

• QNAP Quts Hero: version h5.3.0.3115 only; version h5.3.0.3145 only; version h5.3.0.3192 only; version h5.3.1.3250 only; version h5.3.1.3292 only

Published 2026-02-11. Last modified 2026-06-17.