CVE record · CVE-2021-34423

Buffer overflow in Zoom client and other products

CVSS 7.3 HighEPSS 0.033 · 88th percentile

Published by the CVE Program (CNA: Zoom) at 24 Nov 2021, 16:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Zoom Video Communications Inc	Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows)	affected unspecified to before 5.8.4 custom
Zoom Video Communications Inc	Zoom Client for Meetings for Blackberry (for Android and iOS)	affected unspecified to before 5.8.1 custom
Zoom Video Communications Inc	Zoom Client for Meetings for intune (for Android and iOS)	affected unspecified to before 5.8.4 custom
Zoom Video Communications Inc	Zoom Client for Meetings for Chrome OS	affected unspecified to before 5.0.1 custom
Zoom Video Communications Inc	Zoom Rooms for Conference Room (for Android, AndroidBali, macOS, and Windows)	affected unspecified to before 5.8.3 custom
Zoom Video Communications Inc	Controllers for Zoom Rooms (for Android, iOS, and Windows)	affected unspecified to before 5.8.3 custom
Zoom Video Communications Inc	Zoom VDI Windows Meeting Client	affected unspecified to before 5.8.4 custom
Zoom Video Communications Inc	Zoom VDI Azure Virtual Desktop Plugins (for Windows x86 or x64, IGEL x64, Ubuntu x64, HP ThinPro OS x64)	affected unspecified to before 5.8.4.21112 custom
Zoom Video Communications Inc	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)	affected unspecified to before 5.8.4.21112 custom
Zoom Video Communications Inc	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)	affected unspecified to before 5.8.4.21112 custom
Zoom Video Communications Inc	Zoom Meeting SDK for Android	affected unspecified to before 5.7.6.1922 custom
Zoom Video Communications Inc	Zoom Meeting SDK for iOS	affected unspecified to before 5.7.6.1082 custom
Zoom Video Communications Inc	Zoom Meeting SDK for macOS	affected unspecified to before 5.7.6.1340 custom
Zoom Video Communications Inc	Zoom Meeting SDK for Windows	affected unspecified to before 5.7.6.1081 custom
Zoom Video Communications Inc	Zoom Video SDK (for Android, iOS, macOS, and Windows)	affected unspecified to before 1.1.2 custom
Zoom Video Communications Inc	Zoom On-Premise Meeting Connector Controller	affected unspecified to before 4.8.12.20211115 custom
Zoom Video Communications Inc	Zoom On-Premise Meeting Connector MMR	affected unspecified to before 4.8.12.20211115 custom
Zoom Video Communications Inc	Zoom On-Premise Recording Connector	affected unspecified to before 5.1.0.65.20211116 custom
Zoom Video Communications Inc	Zoom On-Premise Virtual Room Connector	affected unspecified to before 4.4.7266.20211117 custom
Zoom Video Communications Inc	Zoom On-Premise Virtual Room Connector Load Balancer	affected unspecified to before 2.5.5692.20211117 custom
Zoom Video Communications Inc	Zoom Hybrid Zproxy	affected unspecified to before 1.0.1058.20211116 custom
Zoom Video Communications Inc	Zoom Hybrid MMR	affected unspecified to before 4.6.20211116.131_x86-64 custom

Identifiers: CVE-2021-34423
CNA: Zoom
Tags: Zoom Video Communications Inc Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows)
Zoom Video Communications Inc Zoom Client for Meetings for Blackberry (for Android and iOS)
Zoom Video Communications Inc Zoom Client for Meetings for intune (for Android and iOS)
Zoom Video Communications Inc Zoom Client for Meetings for Chrome OS
Zoom Video Communications Inc Zoom Rooms for Conference Room (for Android, AndroidBali, macOS, and Windows)
Zoom Video Communications Inc Controllers for Zoom Rooms (for Android, iOS, and Windows)
Zoom Video Communications Inc Zoom VDI Windows Meeting Client
Zoom Video Communications Inc Zoom VDI Azure Virtual Desktop Plugins (for Windows x86 or x64, IGEL x64, Ubuntu x64, HP ThinPro OS x64)
Published: 24 Nov 2021
Updated: 17 Sept 2024

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.3	High	3.0	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L	CNA (Zoom)

CISA KEV Not listed.
EPSS 0.033, the 88th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 24 Nov 2021. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.