CVE-2025-49464: 
NixOS vulnerability analysis and mitigation

CVE-2025-49464 is an improper authentication vulnerability (with an associated classic buffer overflow, CWE-120) affecting Zoom Clients for macOS and Windows before version 6.4.5. The flaw may allow an unauthenticated or low-privileged network attacker to impact application integrity or trigger a denial-of-service condition. It was disclosed by Zoom on July 8, 2025, under security bulletin ZSB-25027/ZSB-25028, and published to NVD on July 10, 2025. The CVSS v3.1 base score is 6.5 (Medium), though Feedly's category estimate rates it as HIGH (Zoom Advisory).

The vulnerability is classified under CWE-120 (Buffer Copy without Checking Size of Input — Classic Buffer Overflow) and involves improper authentication logic in certain Zoom client components. An attacker with network access and low privileges (or potentially unauthenticated, per the macOS advisory) can send crafted network input that bypasses authentication checks and triggers a buffer overflow condition. The attack vector is network-based, requires low complexity, and no user interaction, making it straightforward to exploit remotely. No public proof-of-concept code has been identified at this time (Zoom Advisory, ENISA EUVD).

Successful exploitation primarily impacts availability, as the vulnerability can be leveraged to cause a denial-of-service (DoS) condition in affected Zoom clients. The CVSS scoring reflects no confidentiality or integrity impact (C:N/I:N/A:H), meaning attackers cannot directly exfiltrate data or modify files, but can disrupt Zoom client functionality for targeted users. The scope is limited to the affected client instance and does not indicate lateral movement potential based on available information (Zoom Advisory, ENISA EUVD).

Zoom has released version 6.4.5 of the Zoom Client for macOS and Windows, which addresses this vulnerability. Users should update to version 6.4.5 or later via the official Zoom download page (https://zoom.us/download) or through the in-app update mechanism. No configuration-based workarounds have been published; upgrading is the recommended and only confirmed remediation (Zoom Advisory).

Security news outlets including CyberSecurityNews, SecurityOnline, and Rewterz covered the disclosure, noting that the flaw exposes Zoom for Windows users to DoS attacks. Community aggregators such as RedPacketSecurity and VulnDB indexed the CVE shortly after disclosure. No notable independent researcher commentary or significant social media debate has been identified beyond routine vulnerability reporting (CyberSecurityNews, SecurityOnline, Rewterz).