Review reviewCritical

CVE-2025-66276

QNAP Systems Inc. QTS, QuTS hero, qts

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

PRIORITY ASSESSMENT

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.29%

Technical severityCVSS 9.2

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

Product: QNAP Systems Inc. QTS, QuTS hero, qts
Affected versions: >= 5.2.0 < 5.2.7.3256 build 20250913, >= 4.3.0 < 5.2.7.3256
Fixed versions: 5.2.7.3256

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that QNAP Systems Inc. QTS, QuTS hero, qts and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: Not available