CVE-2025-66276 | BDVDB-2026-339404 Detail

QNAP SystemsQTS

Description#

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

Per CVSS v4.0: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

No weakness recorded in the source data.

No public exploit known

9.2 Critical

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 21.7.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Not classified

No specific action is recorded in the source data. Check the references for vendor guidance.

Vulnerable
>= 5.2.0 and < 5.2.7.3256 build 20250913
Fixed
5.2.7.3256 build 20250913

9.2 Critical

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

Not available

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).