CVE-2021-34423: Buffer overflow in Zoom client and other products
First published: Wed Nov 24 2021(Updated: )
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.
Credit: security@zoom.us
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Zoom Meeting SDK | <5.8.3 | |
| Android | ||
| Zoom Meeting SDK | <5.8.4 | |
| Apple iOS and macOS | ||
| iOS | ||
| Linux Kernel | ||
| Microsoft Windows | ||
| Zoom Meetings | <5.8.1 | |
| Zoom Meetings | <5.8.4 | |
| Zoom Cloud Meetings | <5.0.1 | |
| Zoom Rooms | <5.8.3 | |
| Zoom Rooms Controller | <5.8.3 | |
| Oracle Virtual Desktop Infrastructure | <5.8.4 | |
| Zoom | <5.7.6.1922 | |
| Zoom Meeting SDK | <5.7.6.1082 | |
| Zoom macOS Meeting SDK | <5.7.6.1340 | |
| Zoom Meeting SDK | <5.7.6.1081 | |
| Zoom Video SDK | <1.1.2 | |
| Zoom Video SDK | <1.1.2 | |
| Zoom Video SDK for macOS | <1.1.2 | |
| Zoom Video SDK | <1.1.2 | |
| Zoom Hybrid MMR | <4.6.20211116.131 | |
| Zoom Hybrid Zproxy | <1.0.1058.20211116 | |
| Zoom On-Premise Meeting Connector Controller | <4.8.12.20211115 | |
| Zoom On-Premise Meeting Connector Multimedia Router | <4.8.12.20211115 | |
| Zoom On-Premise Recording Connector | <5.1.0.65.20211116 | |
| Zoom Zoom On-Premise Virtual Room Connector | <4.4.7266.20211117 | |
| Zoom Zoom On-Premise Virtual Room Connector Load Balancer | <2.5.5692.20211117 | |
| Zoom VDI Azure Virtual Desktop | <5.8.4.21112 | |
| Zoom VDI Citrix | <5.8.4.21112 | |
| Zoom VDI VMware | <5.8.4.21112 | |
| Zoom Meetings | <5.8.4 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-34423?
CVE-2021-34423 is classified as a high-severity vulnerability due to its buffer overflow nature.
How do I fix CVE-2021-34423?
To fix CVE-2021-34423, upgrade to Zoom Client for Meetings version 5.8.4 or higher.
Which versions of Zoom are affected by CVE-2021-34423?
CVE-2021-34423 affects Zoom Client for Meetings versions up to 5.8.3 for various platforms.
Is CVE-2021-34423 a threat to Zoom on all platforms?
Yes, CVE-2021-34423 affects Zoom on Android, iOS, Linux, macOS, and Windows platforms.
What type of vulnerability is CVE-2021-34423?
CVE-2021-34423 is a buffer overflow vulnerability that can potentially allow remote code execution.
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