CVE-2021-34418: Zoom On-Premise Meeting Connector Controller

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR before version 4.6.239.20200613, Zoom On-Premise Recording Connector before version 3.8.42.20200905, Zoom On-Premise Virtual Room Connector before version 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5492.20200616 fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service.

Affected products

• Zoom Zoom On-Premise Meeting Connector Controller: before 4.6.239.20200613 (fixed in 4.6.239.20200613)
• Zoom Zoom On-Premise Meeting Connector Mmr: before 4.6.239.20200613 (fixed in 4.6.239.20200613)
• Zoom Zoom On-Premise Recording Connector: before 3.8.42.20200905 (fixed in 3.8.42.20200905)
• Zoom Zoom On-Premise Virtual Room Connector: before 4.4.6344.20200612 (fixed in 4.4.6344.20200612)
• Zoom Zoom On-Premise Virtual Room Connector Load Balancer: before 2.5.5492.20200616 (fixed in 2.5.5492.20200616)

Published 2021-11-11. Last modified 2026-06-17.