An out-of-bounds write vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify or corrupt memory.

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

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

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 High

Integrity Impact High

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

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. Qsync Central unaffected
Version Status Constraints
5.0.x.x affected < 5.0.0.4 ( 2026/01/20 )

Configuration 1 [-]

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

No data.

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Vendors Products
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Project Subscriptions

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Qnap Systems Subscribe
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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 21:15:00 +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': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 An out-of-bounds write vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify or corrupt memory. 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-787
References
Metrics cvssV4_0

{'score': 4.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: qnap

Published:

Updated: 2026-02-11T14:28:30.435Z

Reserved: 2025-03-20T02:53:29.059Z

Link: CVE-2025-30276

cve-icon Vulnrichment

Updated: 2026-02-11T14:28:24.868Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-11T13:15:52.130

Modified: 2026-02-11T21:13:45.030

Link: CVE-2025-30276

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-11T21:38:17Z

Weaknesses