A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack.

We have already fixed the vulnerability in the following version:
QuTS hero h5.3.2.3354 build 20251225 and later

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

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.

No EPSS score available.

Exploitation none

Automatable no

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. QuTS hero unaffected
Version Status Constraints
? affected < h5.3.2.3354 build 20251225

No data.

No data.

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Vendors Products
Qnap Systems Subscribe
Quts Hero Subscribe

Project Subscriptions

Vendors Products
Qnap Systems Subscribe
Quts Hero Subscribe
Advisories

No advisories yet.

Fixes

Solution

We have already fixed the vulnerability in the following version: QuTS hero h5.3.2.3354 build 20251225 and later

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.qnap.com/en/security-advisory/qsa-26-08 cve-icon cve-icon
History

Wed, 11 Feb 2026 22:15:00 +0000

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

Wed, 11 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 11 Feb 2026 12:45:00 +0000

Type Values Removed Values Added
Description A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: QuTS hero h5.3.2.3354 build 20251225 and later
Title QuTS hero
Weaknesses CWE-476
References
Metrics cvssV4_0

{'score': 1.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: qnap

Published:

Updated: 2026-02-11T16:49:33.097Z

Reserved: 2025-11-26T09:25:37.832Z

Link: CVE-2025-66274

cve-icon Vulnrichment

Updated: 2026-02-11T16:49:30.495Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-11T13:15:58.243

Modified: 2026-02-11T15:27:26.370

Link: CVE-2025-66274

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-11T21:45:33Z

Weaknesses