CVE-2021-33907
The Zoom Client for Meetings for Windows in all versions before 5.3.0 fails to properly validate...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-33907- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 10.0 High
AV:N/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-295
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-33907- Updated
- 2026-11-02
EUVDEUVD-2021-20579 No score
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.
- Record
EUVD-2021-20579- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f38f-hqfr-4qj5 No score
The Zoom Client for Meetings for Windows in all versions before 5.3.0 fails to properly validate...
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.
- Record
GHSA-f38f-hqfr-4qj5- Weakness
- CWE-295
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33907 is a critical vulnerability (CVSS 9.8) in Zoom Meetings, published September 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.01%, the 90th percentile. No source names a fixed version.