Skip to content
Fencer Intel
high 7.8

CVE-2021-34409 json

Zoom Client Installer Local Privilege Escalation

published 5y ago modified 4mo ago also EUVD-2021-21067

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

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.

Patch / fix

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

Is CVE-2021-34409 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • 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

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.