CVE-2021-34423

CRITICAL

Zoom Meetings < 5.8.3 - Buffer Overflow

Title source: rule

Description

A buffer overflow vulnerability was discovered in Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) before version 5.8.4, Zoom Client for Meetings for Blackberry (for Android and iOS) before version 5.8.1, Zoom Client for Meetings for intune (for Android and iOS) before version 5.8.4, Zoom Client for Meetings for Chrome OS before version 5.0.1, Zoom Rooms for Conference Room (for Android, AndroidBali, macOS, and Windows) before version 5.8.3, Controllers for Zoom Rooms (for Android, iOS, and Windows) before version 5.8.3, Zoom VDI Windows Meeting Client before version 5.8.4, Zoom VDI Azure Virtual Desktop Plugins (for Windows x86 or x64, IGEL x64, Ubuntu x64, HP ThinPro OS x64) before version 5.8.4.21112, Zoom VDI Citrix Plugins (for Windows x86 or x64, Mac Universal Installer & Uninstaller, IGEL x64, eLux RP6 x64, HP ThinPro OS x64, Ubuntu x64, CentOS x 64, Dell ThinOS) before version 5.8.4.21112, Zoom VDI VMware Plugins (for Windows x86 or x64, Mac Universal Installer & Uninstaller, IGEL x64, eLux RP6 x64, HP ThinPro OS x64, Ubuntu x64, CentOS x 64, Dell ThinOS) before version 5.8.4.21112, Zoom Meeting SDK for Android before version 5.7.6.1922, Zoom Meeting SDK for iOS before version 5.7.6.1082, Zoom Meeting SDK for macOS before version 5.7.6.1340, Zoom Meeting SDK for Windows before version 5.7.6.1081, Zoom Video SDK (for Android, iOS, macOS, and Windows) before version 1.1.2, Zoom On-Premise Meeting Connector Controller before version 4.8.12.20211115, Zoom On-Premise Meeting Connector MMR before version 4.8.12.20211115, Zoom On-Premise Recording Connector before version 5.1.0.65.20211116, Zoom On-Premise Virtual Room Connector before version 4.4.7266.20211117, Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5692.20211117, Zoom Hybrid Zproxy before version 1.0.1058.20211116, and Zoom Hybrid MMR before version 4.6.20211116.131_x86-64. This can potentially allow a malicious actor to crash the service or application, or leverage this vulnerability to execute arbitrary code.

References (2)

Core 2

Core References

Vendor Advisory x_refsource_misc

https://explore.zoom.us/en/trust/security/security-bulletin

Third Party Advisory, VDB Entry x_refsource_misc

http://packetstormsecurity.com/files/165417/Zoom-Chat-Message-Processing-Buffer-Overflow.html

Scores

CVSS v3 9.8

EPSS 0.0039

EPSS Percentile 59.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-120

Status published

Products (26)

zoom/android_meeting_sdk < 5.7.6.1922

zoom/android_video_sdk < 1.1.2

zoom/controllers_for_zoom_rooms < 5.8.3

zoom/hybrid_mmr < 4.6.20211116.131

zoom/hybrid_zproxy < 1.0.1058.20211116

zoom/iphone_os_meeting_sdk < 5.7.6.1082

zoom/iphone_os_video_sdk < 1.1.2

zoom/macos_meeting_sdk < 5.7.6.1340

zoom/macos_video_sdk < 1.1.2

zoom/meetings < 5.8.3

... and 16 more

Published Nov 24, 2021

Tracked Since Feb 18, 2026