Vulnerability in Zoom Meetings

CVE-2021-33907

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.

Vulnerability class: Improper Certificate Validation

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.030 (86.7th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-33907: held from 0.030 to 0.030.

EPSS over last 30 days · oldest: 0.030 · newest: 0.030 · change: 0.000

Affected products

  • Zoom Meetings
  • Zoom Client For Meetings Windows — versions All versions of the Zoom Client for Meetings for Windows before version 5.3.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-33907?
CVE-2021-33907 is a critical-severity vulnerability in Zoom Meetings, classified under Improper Certificate Validation. CVSS score: 9.8/10. Published 2021-09-27.
How severe is CVE-2021-33907?
Critical severity. CVSS v3 base score is 9.8 out of 10.