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CVE-2025-66276

QNAP Qts vulnerability

9.8 CRITICALEPSS 0.29%
  1. Published10 Jun 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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

QNAP Qts≥ 4.3.0 < 5.2.7.3256

Remediation

Fixed in
QNAP Qts≥ 5.2.7.3256

References

Frequently asked

Is CVE-2025-66276 being actively exploited?

CVE-2025-66276 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.29%.

How severe is CVE-2025-66276?

CVE-2025-66276 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.29% probability of exploitation.

Which products are affected by CVE-2025-66276?

Affected products include QNAP Qts.

How do I fix CVE-2025-66276?

Upgrade affected software to a fixed version, for example QNAP Qts 5.2.7.3256 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66276 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.