CVE-2021-34424: Process memory exposure in Zoom Client and other products

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-24 · updated 2026-06-17
Weakness: CWE-125

Description

A vulnerability was discovered in the 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 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 which potentially allowed for the exposure of the state of process memory. This issue could be used to potentially gain insight into arbitrary areas of the product's memory.

Affected products

Zoom Android Meeting Sdk: before 5.7.6.1922 — fixed in 5.7.6.1922
Zoom Android Video Sdk: before 1.1.2 — fixed in 1.1.2
Zoom Controllers For Zoom Rooms: before 5.8.3 — fixed in 5.8.3
Zoom Hybrid Mmr: before 4.6.20211116.131 — fixed in 4.6.20211116.131
Zoom Hybrid Zproxy: before 1.0.1058.20211116 — fixed in 1.0.1058.20211116
Zoom Iphone Os Meeting Sdk: before 5.7.6.1082 — fixed in 5.7.6.1082
Zoom Iphone Os Video Sdk: before 1.1.2 — fixed in 1.1.2
Zoom Macos Meeting Sdk: before 5.7.6.1340 — fixed in 5.7.6.1340
Zoom Macos Video Sdk: before 1.1.2 — fixed in 1.1.2
Zoom Workplace: before 5.8.3; before 5.8.4 — fixed in 5.8.3, 5.8.4
Zoom Meetings For Blackberry: before 5.8.1 — fixed in 5.8.1
Zoom Meetings For Chrome Os: before 5.0.1 — fixed in 5.0.1
Zoom Meetings For Intune: before 5.8.4 — fixed in 5.8.4
Zoom Rooms For Conference Rooms: before 5.8.3 — fixed in 5.8.3
Zoom Vdi Azure Virtual Desktop: before 5.8.4.21112 — fixed in 5.8.4.21112
Zoom Vdi Citrix: before 5.8.4.21112 — fixed in 5.8.4.21112
Zoom Vdi Vmware: before 5.8.4.21112 — fixed in 5.8.4.21112
Zoom Virtual Desktop Infrastructure: before 5.8.4 — fixed in 5.8.4
Zoom Windows Meeting Sdk: before 5.7.6.1081 — fixed in 5.7.6.1081
Zoom Windows Video Sdk: before 1.1.2 — fixed in 1.1.2
Zoom Video Communications Inc Zoom On-Premise Meeting Connector Controller: before 4.8.12.20211115 — fixed in 4.8.12.20211115
Zoom Video Communications Inc Zoom On-Premise Meeting Connector MMR: before 4.8.12.20211115 — fixed in 4.8.12.20211115
Zoom Video Communications Inc Zoom On-Premise Recording Connector: before 5.1.0.65.20211116 — fixed in 5.1.0.65.20211116
Zoom Video Communications Inc Zoom On-Premise Virtual Room Connector: before 4.4.7266.20211117 — fixed in 4.4.7266.20211117
Zoom Video Communications Inc Zoom On-Premise Virtual Room Connector Load Balancer: before 2.5.5692.20211117 — fixed in 2.5.5692.20211117

How to fix

Upgrade to a fixed version: 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 Workplace 5.8.3, 5.8.4; Zoom Meetings For Blackberry 5.8.1; Zoom Meetings For Chrome Os 5.0.1. Check the vendor advisory for mitigations.

References

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