CVE-2021-34423
9.8 · CRITICALOverview
CVE-2021-34423 is a critical-severity vulnerability affecting zoom meetings. It was published on November 24, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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 Inst
Remediation
Check the references section for vendor advisories and patches from zoom. Update meetings to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| zoom | meetings | >= 0, < 5.8.3 | Affected |
| zoom | meetings_for_blackberry | >= 0, < 5.8.1 | Affected |
| zoom | meetings_for_intune | >= 0, < 5.8.4 | Affected |
| zoom | meetings_for_chrome_os | >= 0, < 5.0.1 | Affected |
| zoom | rooms_for_conference_rooms | >= 0, < 5.8.3 | Affected |
| zoom | controllers_for_zoom_rooms | >= 0, < 5.8.3 | Affected |
| zoom | virtual_desktop_infrastructure | >= 0, < 5.8.4 | Affected |
| zoom | android_meeting_sdk | >= 0, < 5.7.6.1922 | Affected |
| zoom | iphone_os_meeting_sdk | >= 0, < 5.7.6.1082 | Affected |
| zoom | macos_meeting_sdk | >= 0, < 5.7.6.1340 | Affected |
| zoom | windows_meeting_sdk | >= 0, < 5.7.6.1081 | Affected |
| zoom | android_video_sdk | >= 0, < 1.1.2 | Affected |
| zoom | iphone_os_video_sdk | >= 0, < 1.1.2 | Affected |
| zoom | macos_video_sdk | >= 0, < 1.1.2 | Affected |
| zoom | windows_video_sdk | >= 0, < 1.1.2 | Affected |
References
Frequently Asked Questions
What is CVE-2021-34423?
CVE-2021-34423 is a critical-severity vulnerability affecting zoom meetings. It was published on November 24, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2021-34423?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-34423?
Check the references section for vendor advisories and patches from zoom. Update meetings to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-34423?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-34423 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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