CVE-2021-34423
Last modified
CVE-2021-34423 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 3.21% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zoom | Meetings | < 5.8.3 |
| Zoom | Meetings | < 5.8.4 |
| Zoom | Meetings For Blackberry | < 5.8.1 |
| Zoom | Meetings For Intune | < 5.8.4 |
| Zoom | Meetings For Chrome Os | < 5.0.1 |
| Zoom | Rooms For Conference Rooms | < 5.8.3 |
| Zoom | Controllers For Zoom Rooms | < 5.8.3 |
| Zoom | Virtual Desktop Infrastructure | < 5.8.4 |
| Zoom | Android Meeting Sdk | < 5.7.6.1922 |
| Zoom | Iphone Os Meeting Sdk | < 5.7.6.1082 |
| Zoom | Macos Meeting Sdk | < 5.7.6.1340 |
| Zoom | Windows Meeting Sdk | < 5.7.6.1081 |
| Zoom | Android Video Sdk | < 1.1.2 |
| Zoom | Iphone Os Video Sdk | < 1.1.2 |
| Zoom | Macos Video Sdk | < 1.1.2 |
| Zoom | Windows Video Sdk | < 1.1.2 |
| Zoom | Hybrid Mmr | < 4.6.20211116.131 |
| Zoom | Hybrid Zproxy | < 1.0.1058.20211116 |
| Zoom | Zoom On-Premise Meeting Connector Controller | < 4.8.12.20211115 |
| Zoom | Zoom On-Premise Meeting Connector Mmr | < 4.8.12.20211115 |
| Zoom | 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 | Vdi Windows Meeting Client | < 5.8.4 |
References
- http://packetstormsecurity.com/files/165417/Zoom-Chat-Message-Processing-Buffer-Overflow.htmlThird Party Advisory, VDB Entry
- https://explore.zoom.us/en/trust/security/security-bulletinVendor Advisory
- http://packetstormsecurity.com/files/165417/Zoom-Chat-Message-Processing-Buffer-Overflow.htmlThird Party Advisory, VDB Entry
- https://explore.zoom.us/en/trust/security/security-bulletinVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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