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PatchSiren cyber security CVE debrief

CVE-2025-66279 QNAP Systems Inc. CVE debrief

CVE-2025-66279 is a high-severity command injection vulnerability affecting several QNAP operating system versions. An attacker with administrator privileges, after gaining access, can exploit this vulnerability to execute arbitrary commands. The vulnerability has been addressed in the following versions: QTS 5.2.9.3410 build 20260214 and later, QuTS hero h5.2.9.3410 build 20260214 and later, QuTS hero h5.3.4.3500 build 20260520 and later, and QuTS hero h6.0.0.3397 build 20260206 and later.

Vendor
QNAP Systems Inc.
Product
QTS
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-15
Advisory published
2026-06-10
Advisory updated
2026-06-15

Who should care

Administrators and users of QNAP operating systems, particularly those using versions prior to the patched releases, should be aware of this vulnerability and take immediate action to update their systems.

Technical summary

The vulnerability, tracked as CVE-2025-66279, has a CVSS score of 8.6, indicating a high severity level. It allows an attacker to inject commands if they have administrator-level access. The Common Weakness Enumeration (CWE) for this vulnerability is CWE-78, which pertains to improper neutralization of special elements used in an OS command.

Defensive priority

High

Recommended defensive actions

  • Update QTS to version 5.2.9.3410 build 20260214 or later
  • Update QuTS hero h5.2.9 to version 5.2.9.3410 build 20260214 or later
  • Update QuTS hero h5.3.4 to version 5.3.4.3500 build 20260520 or later
  • Update QuTS hero h6.0.0 to version 6.0.0.3397 build 20260206 or later

Evidence notes

The information provided is based on data from official sources, including [cve-org](https://www.cve.org/CVERecord?id=CVE-2025-66279), [nvd](https://nvd.nist.gov/vuln/detail/CVE-2025-66279), and [ref-4](https://www.qnap.com/en/security-advisory/qsa-26-10).

Sources and references

Verified primary and authoritative sources

  • CVE-2025-66279 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-66279

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

  • CVE-2025-66279 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-66279

    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.