Vulnerability in Zoom Client For Meetings
CVE-2021-34420
The Zoom Client for Meetings for Windows installer before version 5.5.4 does not properly verify the signature of files with .msi, .ps1, and .bat extensions. This could lead to a malicious actor installing malicious software on a customer’s computer.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Zoom Client For Meetings
- Zoom Video Communications Inc Client For Meetings Windows — versions unspecified
Weakness classification (CWE)
References
- explore.zoom.us/en/trust/security/security-bulletin (Vendor Advisory)
- medium.com/manomano-tech/a-red-team-operation-leveraging-a-zero-day-vulnerabili… (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-34420?
- CVE-2021-34420 is a medium-severity vulnerability in Zoom Client For Meetings, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.7/10. Published 2021-11-11.
- How severe is CVE-2021-34420?
- Medium severity. CVSS v3 base score is 4.7 out of 10.