CVE-2021-33907 json
The Zoom Client for Meetings for Windows in all versions before 5.3.0 fails to properly validate the certificate information used to sign .…
published 2021-09-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20579
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.0%
- EPSS 4.0% chance of exploitation in 30 days, percentile 90%
- public exploits
- 0
- none known
Summary
The Zoom Client for Meetings for Windows in all versions before 5.3.0 fails to properly validate the certificate information used to sign .msi files when performing an update of the client. This could lead to remote code execution in an elevated privileged context.
Patch / fix
- zoom meetings 5.3.0
Exploit prediction
4.01% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 10.0 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
Affected products
- n/a Zoom Client for Meetings for Windows
Classification
- Weakness
-
- CWE-295 Improper Certificate Validation
References
-
explore.zoom.us
/en/trust/security/security-bulletin/
vendor-advisory
Sources
- CVE List CVE-2021-33907
- NVD CVE-2021-33907
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