Vulnerability in Qnap Qts

CVE-2025-66276

QuTS hero is not affected. We have already fixed the vulnerability in the following version: QTS 5.2.7.3256 build 20250913 and later

EPSS: 0.003 (21.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Qnap Qts
Qnap Systems Inc. Qts — versions 5.2.0
Qnap Systems Inc. Quts Hero — versions ?

References

security@qnapsecurity.com.tw (Vendor Advisory)

Frequently asked questions

What is CVE-2025-66276?: CVE-2025-66276 is a critical-severity vulnerability in Qnap Qts. CVSS score: 9.8/10. Published 2026-06-10.
How severe is CVE-2025-66276?: Critical severity. CVSS v3 base score is 9.8 out of 10.