Zoom's Linux Client at Risk: Unpacking CVE-2025-46788's Certificate Validation Flaw

Introduction

Zoom, a leading platform for video conferencing and remote collaboration, faces a significant security challenge with CVE-2025-46788. This vulnerability specifically targets Zoom Workplace and Meeting SDK for Linux, potentially allowing attackers to intercept sensitive communications through man-in-the-middle (MitM) attacks. Given Zoom's widespread adoption, particularly in enterprise environments, this flaw poses a substantial risk to confidentiality and data integrity.

Technical Information

CVE-2025-46788 involves improper certificate validation (CWE-295) within Zoom's Linux client. During the TLS handshake, the application inadequately verifies the authenticity of server certificates against trusted certificate authorities. This oversight allows attackers positioned within the network path—such as compromised routers or malicious Wi-Fi hotspots—to present fraudulent certificates. Consequently, attackers can seamlessly intercept, decrypt, or modify communications between Zoom clients and servers without triggering security alerts.

Affected versions include Zoom Workplace Desktop App for Linux versions 5.1.418436.0628 through 6.4.12 and Zoom Meeting SDK for Linux versions 5.15.5 through 6.4.10. The vulnerability is exclusive to Linux implementations due to platform-specific differences in Zoom's networking code.

Affected Systems and Versions

Zoom Workplace Desktop App for Linux: Versions 5.1.418436.0628 through 6.4.12
Zoom Meeting SDK for Linux: Versions 5.15.5 through 6.4.10

Patch Information

To address CVE-2025-46788, Zoom has released a critical patch in version 6.4.13. Users must immediately update their Zoom Workplace and Meeting SDK for Linux to this version or later. The update enforces proper certificate validation, effectively mitigating the risk of MitM attacks.

Update Instructions:

Download the Latest Version: Visit the Zoom Download Center to obtain the latest version.
Install the Update: Execute the installer and follow the provided instructions.
Verify Installation: Confirm the version number via the 'Help' > 'About Zoom' menu.

Regularly monitor Zoom's Security Bulletins for future updates.

Vendor Security History

Zoom has previously encountered security challenges, notably encryption-related vulnerabilities. The company's rapid response to CVE-2025-46788, issuing a patch within 48 hours, reflects improved security maturity. However, recurring certificate validation issues across platforms indicate ongoing challenges in cryptographic implementation.

References

By promptly addressing this vulnerability, organizations can significantly reduce their exposure to potential MitM attacks and safeguard sensitive Zoom communications.

Source: This report was created using AI

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