Time-of-check time-of-use race condition in Zoom Plugin for Microsoft Outlook for MacOS
Priority LOW 34CWE-367Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.00585 48th percentileScored 2026-11-07
Fix Fixed Zoom Plugin for Microsoft Outlook for MacOS: 5.3.52553.0918
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Zoom Plugin for Microsoft Outlook for MacOS | before 5.3.52553.0918 | 5.3.52553.0918 | Patch available | CNA |
- Zoom Plugin for Microsoft Outlook for MacOS Vendor— Affected before 5.3.52553.0918 Fixed in 5.3.52553.0918 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:zoom:zoom_plugin_for_microsoft_outlook:*:*:*:*:*:windows:*:* | before 5.3.52553.0918 | Vulnerable | Zoom Video Communications, Inc. |
- cpe:2.3:a:zoom:zoom_plugin_for_microsoft_outlook:*:*:*:*:*:windows:*:* Versions before 5.3.52553.0918 Vulnerable ·Zoom Video Communications, Inc.
Remediation
- Fix · CNA Zoom Plugin for Microsoft Outlook for MacOS Fixed in 5.3.52553.0918
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34413
- 2026-10-03 Alias added: GHSA-mgjc-79v8-mc48
References
More Zoom Video Communications, Inc. Zoom Plugin For Microsoft Outlook vulnerabilities
- TI-2022-07031 Local privilege escalation in Windows Zoom Clients CVSS 3.1HIGH 7.9
- TI-2021-13444 Incorrect permission assignment in Zoom Plugin for Microsoft Outlook for Mac CVSS 3.1HIGH 7.8
Sources
- CVE-2021-34413 · CVE Program
- CVE-2021-34413 · NVD
- FIRST EPSS
- GHSA-mgjc-79v8-mc48 · GitHub Advisory Database · CC BY 4.0
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