A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to launch a denial-of-service (DoS) attack.

We have already fixed the vulnerability 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
QuTS hero h6.0.0.3397 build 20260206 and later

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00153.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
QNAP Systems Inc. QTS unaffected
Version Status Constraints
5.2.0 affected < 5.2.9.3410 build 20260214
QNAP Systems Inc. QuTS hero unaffected
Version Status Constraints
h5.2.0 affected < h5.2.9.3410 build 20260214
h5.3.0 affected < h5.3.4.3500 build 20260520
? affected < h6.0.0.3397 build 20260206

No data.

No data.

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Vendors Products
Qnap Systems Inc. Subscribe
Qts Subscribe
Quts Hero Subscribe

Project Subscriptions

Vendors Products
Qnap Systems Inc. Subscribe
Qts Subscribe
Quts Hero Subscribe
Advisories

No advisories yet.

Fixes

Solution

We have already fixed the vulnerability 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 QuTS hero h6.0.0.3397 build 20260206 and later

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.qnap.com/en/security-advisory/qsa-26-10 cve-icon cve-icon
History

Wed, 10 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 10 Jun 2026 05:30:00 +0000

Type Values Removed Values Added
First Time appeared Qnap Systems Inc.
Qnap Systems Inc. qts
Qnap Systems Inc. quts Hero
Vendors & Products Qnap Systems Inc.
Qnap Systems Inc. qts
Qnap Systems Inc. quts Hero

Wed, 10 Jun 2026 03:45:00 +0000

Type Values Removed Values Added
Description A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability 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 QuTS hero h6.0.0.3397 build 20260206 and later
Title QTS, QuTS hero
Weaknesses CWE-476
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: qnap

Published:

Updated: 2026-06-10T15:50:06.023Z

Reserved: 2025-11-26T09:25:37.833Z

Link: CVE-2025-66281

cve-icon Vulnrichment

Updated: 2026-06-10T15:50:00.618Z

cve-icon NVD

Status : Received

Published: 2026-06-10T04:17:14.383

Modified: 2026-06-10T04:17:14.383

Link: CVE-2025-66281

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-10T05:30:07Z

Weaknesses