NULL pointer dereference in QNAP Qts
CVE-2025-52431
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 5.2.7.3256 build 20250913 and later QuTS hero h5.2.7.3256 build 20250913 and later QuTS hero h5.3.1.3250 build 20250912 and later
EPSS: 0.003 (22.2th percentile) — read the EPSS interpretation.
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.
Affected products
- Qnap Qts — versions 5.2.0.2737, 5.2.0.2744, 5.2.0.2782
- Qnap Quts_hero — versions h5.2.0.2737, h5.2.0.2782, h5.2.0.2789
- Qnap Systems Inc. Qts — versions 5.2.x
- Qnap Systems Inc. Quts Hero — versions h5.2.x, h5.3.x
Weakness classification (CWE)
References
- security@qnapsecurity.com.tw (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-52431?
- CVE-2025-52431 is a medium-severity vulnerability in QNAP Qts, classified under NULL Pointer Dereference. CVSS score: 4.9/10. Published 2026-01-02.
- How severe is CVE-2025-52431?
- Medium severity. CVSS v3 base score is 4.9 out of 10.