CVE-2025-29897 in Qsync Central
Summary
by MITRE • 10/15/2026
A buffer copy without checking size of input vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes.
We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 and later
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Analysis
by VulDB Data Team • 10/15/2026
The identified security flaw within Qsync Central represents a classic buffer overflow condition arising from insufficient validation of input data lengths during copy operations. This type of vulnerability, commonly categorized under CWE-120 Buffer Copy without Checking Size of Input in the Common Weakness Enumeration framework, occurs when an application copies data into a fixed-size memory buffer without verifying that the incoming data fits within the allocated boundaries. In the context of Qsync Central, this architectural weakness allows for potential heap or stack corruption if the input exceeds expected limits. The root cause typically lies in the use of unsafe programming constructs such as strcpy or memcpy without prior bounds checking, which fails to enforce strict length constraints before memory manipulation occurs.
From an operational perspective, the exploitation vector requires a specific precondition: the attacker must first possess valid user credentials for the Qsync Central service. This indicates that the vulnerability is not remotely exploitable by unauthenticated actors but rather targets authenticated sessions. Once access is granted, an adversary can craft maliciously sized inputs to trigger the buffer overflow. The immediate technical impact involves unauthorized modification of adjacent memory regions or overwriting critical control data such as return addresses on the stack. Depending on the specific implementation details and operating system protections in place, this could lead to process crashes resulting in denial of service conditions where the Qsync Central service becomes unresponsive, requiring manual restarts by administrators.
More critically, if the attacker successfully manipulates memory pointers or instruction execution flow through precise buffer overflow techniques, they may achieve arbitrary code execution with the privileges of the compromised user account. This aligns with ATT&CK technique T1059 Command and Scripting Interpreter or potentially higher-level privilege escalation paths depending on how the service is configured and what permissions are assigned to the Qsync Central process. The ability to modify memory structures effectively breaks the integrity guarantees of the application, allowing for data exfiltration, persistence mechanisms installation, or lateral movement within the network if the compromised account has broader access rights.
To mitigate this risk, immediate action must be taken to upgrade all instances of Qsync Central to version 5.0.0.4 or any later release where the vendor has implemented proper input validation and bounds checking routines. It is essential to verify that no legacy versions remain in production environments as they continue to expose organizations to these memory corruption risks. Additionally, administrators should enforce strict least-privilege principles for user accounts associated with Qsync Central services to limit the potential blast radius of any successful exploitation attempt. Regular security patching cycles and monitoring for anomalous process behavior or service interruptions can further enhance defense-in-depth strategies against such vulnerabilities.