CVE-2021-34423
9.8 · CRITICALA 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 a…
Overview
CVE-2021-34423 is a critical-severity vulnerability. 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, patches, and mitigation guidance. 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 CyberStrike helps
Reason, not just scan
It reasons through your app's logic the way a human pentester would, so it finds flaws signature scanners miss.
Learn moreVerified findings
Every finding is proven exploitable before you see it, which cuts the false positives that bury real risk.
Learn moreAI-driven DAST and SAST
Probe running apps and read source from one engine, so issues are caught before and after they ship.
Learn moreOpen source
Read exactly how it tests and what it reports. CyberStrike is open source and in early access.
View the repo
Frequently asked questions
What is CVE-2021-34423?
CVE-2021-34423 is a critical-severity vulnerability. 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, patches, and mitigation guidance. 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 is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-34423 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.
Related CRITICAL CVEs from 2021
View all- 10.0CVE-2020-36155
An issue was discovered in the Ultimate Member plugin before 2.1.12 for WordPress, aka Unauthenticat
View details - 10.0CVE-2020-36157
An issue was discovered in the Ultimate Member plugin before 2.1.12 for WordPress, aka Unauthenticat
View details - 10.0CVE-2020-29491
Dell Wyse ThinOS 8.6 and prior versions contain an insecure default configuration vulnerability. A r
View details - 10.0CVE-2020-29492
Dell Wyse ThinOS 8.6 and prior versions contain an insecure default configuration vulnerability. A r
View details - 10.0CVE-2020-29493
DELL EMC Avamar Server, versions 19.1, 19.2, 19.3, contain a SQL Injection Vulnerability in Fitness
View details - 10.0CVE-2020-29495
DELL EMC Avamar Server, versions 19.1, 19.2, 19.3, contain an OS Command Injection Vulnerability in
View details - 10.0CVE-2021-0211
An improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Ev
View details - 10.0CVE-2021-21243
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, a Kubernetes REST endpoint
View details - 10.0CVE-2021-21244
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, There is a vulnerability th
View details - 10.0CVE-2021-21242
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is a critical vulnera
View details - 10.0CVE-2021-21245
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, AttachmentUploadServlet als
View details - 10.0CVE-2020-6779
Use of Hard-coded Credentials in the database of Bosch FSM-2500 server and Bosch FSM-5000 server up
View details