CVE-2025-66276

CRITICAL

Published Jun 10, 2026 Modified Jun 12, 2026

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

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0029

Probability of exploitation

0.21%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Affected Products

Vendor	Product	Versions
qnap	qts	4.3.0 — 5.2.7.3256

References

Advisories & Patches

https://www.qnap.com/en/security-advisory/qsa-25-56

Frequently Asked Questions

What is 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 It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-66276? +

CVE-2025-66276 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0029, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2025-66276? +

CVE-2025-66276 affects products from qnap, specifically: qts. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66276? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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