CVE-2025-30266
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NULL Pointer Dereference in Qsync Central Enables DoS Attack

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
2026-07-06
AI Q&A
2026-02-11
EPSS Evaluated
2026-07-05
NVD
CVE-2025-30266
EUVD
EUVD-2025-207455

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)

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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.

Essentially, the attacker can trigger a denial-of-service (DoS) attack by exploiting this vulnerability.

Impact Analysis

If exploited, this vulnerability can lead to a denial-of-service (DoS) condition, making Qsync Central unavailable or unresponsive.

An attacker must first gain access to a user account remotely to exploit this vulnerability.

The impact is primarily service disruption rather than data compromise.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

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

Additionally, ensure that remote attackers cannot gain user accounts, as exploitation requires a valid user account.

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