CVE-2021-34409

Zoom Client Installer Local Privilege Escalation

HIGH

7.8

CVSS Score

Published: September 27, 2021 at 01:55 PM UTC

Updated: June 17, 2026 at 03:55 AM UTC

6 products affected across 2 vendorsRoomsMeetingsScreen Sharing

Using Zoom Client for Meetings for MacOS (Standard and for IT Admin) by Zoom Video Communications Inc?

Get instant alerts when new vulnerabilities affect Zoom Client for Meetings for MacOS (Standard and for IT Admin) - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Meetings · Zoom

95%

v < 5.2.0

Affected range stops below 5.2.0, so it looks safe — our inference, not a vendor statement

Rooms · Zoom

95%

v < 5.1.0

Affected range stops below 5.1.0, so it looks safe — our inference, not a vendor statement

Screen Sharing · Zoom

95%

v < 5.2.0

Affected range stops below 5.2.0, so it looks safe — our inference, not a vendor statement

Meetings · Zoom Video Communications

60%

v < 5.2.0

Affected range stops below 5.2.0, so it looks safe — our inference, not a vendor statement

Zoom Rooms · Zoom Video Communications

60%

v < 5.1.0

Affected range stops below 5.1.0, so it looks safe — our inference, not a vendor statement

Screen Share Plugin · Zoom Video Communications

60%

v < 5.2.0

Affected range stops below 5.2.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

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

CVSS

7.8HIGHZoom

Attack Vector: LOCAL
Complexity: HIGH
Privileges: LOW
User Interaction: NONE
Scope: CHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-732

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card