Critical severity · published Nov 24, 2021
CVE-2021-34423
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…
9.8
CVSS
3.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.3% · higher than 88% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AM
Android Meeting Sdk · Zoom
before 5.7.6.1922 · source: NVD
AV
Android Video Sdk · Zoom
before 1.1.2 · source: NVD
CF
Controllers For Zoom Rooms · Zoom
before 5.8.3; before 5.8.3; before 5.8.3 · source: NVD
HM
Hybrid Mmr · Zoom
before 4.6.20211116.131 · source: NVD
HZ
Hybrid Zproxy · Zoom
before 1.0.1058.20211116 · source: NVD
IO
Iphone OS Meeting Sdk · Zoom
before 5.7.6.1082 · source: NVD
IO
Iphone OS Video Sdk · Zoom
before 1.1.2 · source: NVD
MM
Macos Meeting Sdk · Zoom
before 5.7.6.1340 · source: NVD
MV
Macos Video Sdk · Zoom
before 1.1.2 · source: NVD
ME
Meetings · Zoom
before 5.8.3; before 5.8.4; before 5.8.4; before 5.8.4; before 5.8.4 · source: NVD
MF
Meetings For Blackberry · Zoom
before 5.8.1; before 5.8.1 · source: NVD
MF
Meetings For Chrome OS · Zoom
before 5.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-34423
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-34423
Third Party Advisory
http://packetstormsecurity.com/files/165417/Zoom-Chat-Message-Processing-Buffer-Overflow.html
Vendor Advisory
https://explore.zoom.us/en/trust/security/security-bulletin
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