CVE-2025-49464
Summary
by MITRE • 07/10/2025
Classic buffer overflow in certain Zoom Clients for Windows may allow an authorised user to conduct a denial of service via network access.
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Analysis
by VulDB Data Team • 06/03/2026
A classic buffer overflow vulnerability has been identified in specific versions of the Zoom Client software for Windows operating systems, presenting a significant security risk that could be exploited by authorized users with network access. This type of vulnerability occurs when a program attempts to write data beyond the boundaries of a fixed-length buffer, typically resulting in memory corruption that can lead to unpredictable behavior. The flaw manifests in the client-side software's handling of network data packets or user inputs, where insufficient bounds checking allows maliciously crafted data to overwrite adjacent memory locations. The vulnerability is particularly concerning because it can be triggered by an authorized user who already possesses network access to the targeted system, eliminating the need for additional authentication or privilege escalation. This scenario aligns with CWE-121, which describes buffer overflow conditions where insufficient boundary checking allows data to be written beyond the allocated buffer space, potentially causing memory corruption that affects program execution flow. The operational impact of this vulnerability extends beyond simple denial of service, as the memory corruption could potentially be leveraged for more sophisticated attacks if exploited by threat actors with deeper access privileges. The buffer overflow could cause the Zoom client application to crash or behave unpredictably, disrupting video conferencing sessions and potentially affecting business continuity for organizations relying on the platform. The nature of this vulnerability also presents challenges for incident response teams, as the corrupted memory state could make debugging and forensic analysis more complex. Organizations utilizing Zoom clients must consider the potential for cascading effects where a single compromised client could affect network stability or be used as a stepping stone for further attacks. The vulnerability demonstrates the importance of proper input validation and memory management practices in client-side applications, particularly those handling real-time network communications. This flaw represents a classic example of how network-based applications must carefully validate all incoming data to prevent buffer overflows that could be exploited to disrupt services or potentially escalate privileges. Security practitioners should note that while the vulnerability requires network access, it can be particularly dangerous in environments where authorized users have elevated privileges or where the application is used in mission-critical scenarios. The attack surface for this vulnerability includes all Windows systems running affected Zoom client versions, making it a widespread concern for enterprise security teams. According to ATT&CK framework, this vulnerability could be categorized under T1499 which covers network denial of service attacks, potentially leading to additional techniques such as T1071 for application layer protocol usage or T1566 for credential access through compromised client applications. The remediation process requires immediate patching of affected Zoom client versions, along with network monitoring to detect potential exploitation attempts. Organizations should implement network segmentation to limit the potential impact of such vulnerabilities and ensure that all client software installations are kept up to date with security patches. Regular security assessments of client applications should include thorough testing for buffer overflow conditions and other memory corruption vulnerabilities. The vulnerability also highlights the need for robust application sandboxing and privilege separation mechanisms to limit the potential damage from successful exploitation attempts.