A NULL pointer dereference vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user 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:
Qsync Central 5.0.0.4 ( 2026/01/20 ) and later

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

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

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

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

Affected Vendors & Products

Vendors Products
Qnap Subscribe
Qsync Central Subscribe
Qnap Systems Subscribe
Qsync Central Subscribe

Configuration 1 [-]

cpe:2.3:a:qnap:qsync_central:*:*:*:*:*:*:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Qnap Systems Subscribe
Qsync Central Subscribe
Advisories

No advisories yet.

Fixes

Solution

We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.qnap.com/en/security-advisory/qsa-26-02 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 qsync Central
Vendors & Products Qnap Systems
Qnap Systems qsync Central

Wed, 11 Feb 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Qnap
Qnap qsync Central
CPEs cpe:2.3:a:qnap:qsync_central:*:*:*:*:*:*:*:*
Vendors & Products Qnap
Qnap qsync Central
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Wed, 11 Feb 2026 15:15:00 +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 Qsync Central. If a remote attacker gains a user 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: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later
Title Qsync Central
Weaknesses CWE-476
References
Metrics cvssV4_0

{'score': 0.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: qnap

Published:

Updated: 2026-02-11T14:27:44.205Z

Reserved: 2025-03-20T02:53:25.308Z

Link: CVE-2025-30266

cve-icon Vulnrichment

Updated: 2026-02-11T14:27:40.308Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-11T13:15:51.813

Modified: 2026-02-11T21:00:06.077

Link: CVE-2025-30266

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-11T21:38:16Z

Weaknesses