NULL pointer dereference in QNAP Quts Hero
CVE-2025-66274
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
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (29.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- QNAP Quts Hero — versions h5.3.0.3115, h5.3.0.3145, h5.3.0.3192
- QNAP Systems Inc. Qts — versions 5.2.0
- QNAP Systems Inc. Quts Hero — versions h5.2.0, h5.3.0
Weakness classification (CWE)
References
- www.qnap.com/en/security-advisory/qsa-26-08 (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66274?
- CVE-2025-66274 is a medium-severity vulnerability in QNAP Quts Hero, classified under NULL Pointer Dereference. CVSS score: 4.9/10. Published 2026-02-11.
- How severe is CVE-2025-66274?
- Medium severity. CVSS v3 base score is 4.9 out of 10.