Qsync Central 5.0.0.4+ Null Pointer DoS CVE-2025-29895
CVE-2025-29895 Published on October 15, 2026
NULL Pointer Dereference in qsyncsrv.cgi
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 and later
Vulnerability Analysis
CVE-2025-29895 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.
Products Associated with CVE-2025-29895
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Affected Versions
QNAP Systems Inc. Qsync Central:- Version 5.0.x and below 5.0.0.4 is affected.