CVE-2025-44008 in Qsync Central
Summary
by MITRE • 10/03/2025
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 5.0.0.1 ( 2025/07/09 ) and later
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Analysis
by VulDB Data Team • 10/09/2025
This vulnerability represents a critical null pointer dereference flaw in Qsync Central software that exposes the system to remote denial-of-service attacks. The issue occurs when a remote attacker with valid user credentials can manipulate the application's execution flow to cause a null pointer dereference condition. This type of vulnerability falls under the Common Weakness Enumeration category CWE-476 which specifically addresses null pointer dereference conditions that can lead to application crashes or system instability. The flaw demonstrates a fundamental lack of proper input validation and error handling within the application's codebase.
The technical exploitation of this vulnerability requires an attacker to first compromise a legitimate user account, which then provides the necessary access level to trigger the null pointer dereference. Once exploited, the vulnerability allows the attacker to cause the Qsync Central service to crash or become unresponsive, effectively disrupting normal operations and denying legitimate users access to the system. This represents a classic denial-of-service attack vector that can be particularly damaging in enterprise environments where continuous availability is critical. The vulnerability's impact is amplified by the fact that it requires only user-level credentials rather than administrative privileges, making it accessible to a broader range of potential attackers.
From an operational perspective, this vulnerability creates significant risk for organizations relying on Qsync Central for file synchronization and collaboration services. The null pointer dereference can cause cascading failures throughout the system, potentially affecting multiple users simultaneously and creating widespread service disruption. Network administrators must consider the potential for this vulnerability to be leveraged as part of larger attack campaigns where initial access is gained through social engineering or credential compromise, followed by the exploitation of this DoS vulnerability to maintain persistence or cause maximum disruption. The vulnerability also represents a potential entry point for more sophisticated attacks that could exploit the system instability to gain further access or escalate privileges.
The vendor has addressed this vulnerability in Qsync Central version 5.0.0.1 released on July 9, 2025, which includes proper null pointer checks and input validation mechanisms. Organizations should immediately implement this update across all affected systems to prevent exploitation. Additionally, security teams should conduct thorough vulnerability assessments to identify any systems running older versions and ensure complete remediation. The fix should be part of broader security hygiene practices including regular patch management, network monitoring for unusual traffic patterns that might indicate DoS attempts, and user access controls to minimize the attack surface. This vulnerability also highlights the importance of implementing robust error handling practices in application development and the necessity of following secure coding guidelines that prevent null pointer dereference conditions in production software.