CVE-2025-47209
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NULL Pointer Dereference in Qsync Central Enables Remote DoS

Publication date: 2026-02-11

Last updated on: 2026-02-11

Assigner: QNAP Systems, Inc.

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
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Meta Information
Published
2026-02-11
Last Modified
2026-02-11
Generated
2026-06-16
AI Q&A
2026-02-11
EPSS Evaluated
2026-06-15
NVD
CVE-2025-47209
EUVD
EUVD-2025-207453
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
qnap qsync_central From 5.0.0.0 (inc) to 5.0.0.4 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability is a NULL pointer dereference issue affecting Qsync Central. It occurs when a remote attacker who has gained access to a user account exploits the flaw to cause the software to crash or become unavailable.

Impact Analysis

The vulnerability can be exploited to launch a denial-of-service (DoS) attack, which means the affected system or service can be made unavailable or crash, disrupting normal operations.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Qsync Central to version 5.0.0.4 or later, as the vulnerability has been fixed starting from this version.

Additionally, restrict remote user account access to trusted users only, since exploitation requires a remote attacker to have a user account.

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