CVE-2021-34413: Zoom Plugin For Microsoft Outlook

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

All versions of the Zoom Plugin for Microsoft Outlook for MacOS before 5.3.52553.0918 contain a Time-of-check Time-of-use (TOC/TOU) vulnerability during the plugin installation process. This could allow a standard user to write their own malicious application to the plugin directory, allowing the malicious application to execute in a privileged context.

Affected products

• Zoom Zoom Plugin For Microsoft Outlook: before 5.3.52553.0918 (fixed in 5.3.52553.0918)

Published 2021-09-27. Last modified 2026-06-17.