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PatchSiren cyber security CVE debrief

CVE-2025-66276 QNAP CVE debrief

CVE-2025-66276 is a critical vulnerability in QNAP QTS, with a CVSS score of 9.2. The vulnerability has been fixed in QTS 5.2.7.3256 build 20250913 and later. QuTS hero is not affected by this vulnerability.

Vendor
QNAP
Product
QTS
CVSS
CRITICAL 9.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-12
Advisory published
2026-06-10
Advisory updated
2026-06-12

Who should care

Administrators and users of QNAP QTS systems, particularly those using versions prior to QTS 5.2.7.3256 build 20250913.

Technical summary

CVE-2025-66276 is a critical vulnerability in QNAP QTS. The Common Vulnerability Scoring System (CVSS) score is 9.2, indicating a high severity. The vulnerability was published on 2026-06-10T03:16:24.730Z and last modified on 2026-06-12T20:25:51.970Z.

Defensive priority

High

Recommended defensive actions

  • Upgrade to QTS 5.2.7.3256 build 20250913 or later to mitigate the vulnerability.
  • Refer to the vendor advisory at resourceLinkAnnotations with id 'ref-4' for additional information and guidance.

Evidence notes

The information provided is based on data from official sources, including the CVE record and NVD details.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-66276 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-66276

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-66276 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-66276

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.