CVE-2021-34409 json
Zoom Client Installer Local Privilege Escalation
published 2021-09-27 5 y ago modified 2026-06-17 4 mo 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
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
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
-
explore.zoom.us
/en/trust/security/security-bulletin
vendor-advisory
Sources
- CVE List CVE-2021-34409
- NVD CVE-2021-34409
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