What is CVE-2025-66281?

CVE-2025-66281 is a high-severity vulnerability in Qnap Qts, classified under NULL Pointer Dereference. CVSS score: 7.2/10. Published 2026-06-10.

How severe is CVE-2025-66281?

High severity. CVSS v3 base score is 7.2 out of 10.

NULL pointer dereference in Qnap Qts

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 vul…

EPSS: 0.005 (37.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Qnap Qts
Qnap Quts_hero
Qnap Systems Inc. Qts — versions 5.2.0
Qnap Systems Inc. Quts Hero — versions h5.2.0, h5.3.0, ?

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

security@qnapsecurity.com.tw (Broken Link, Vendor Advisory)

Frequently asked questions

What is CVE-2025-66281?: CVE-2025-66281 is a high-severity vulnerability in Qnap Qts, classified under NULL Pointer Dereference. CVSS score: 7.2/10. Published 2026-06-10.
How severe is CVE-2025-66281?: High severity. CVSS v3 base score is 7.2 out of 10.