TI-2021-13454 Aliases CVE-2021-34420 GHSA-xcgw-94hj-93r7

Zoom Windows installation executable signature bypass

LOW 33CWE-347Published 2021-11-11 · Updated 2024-09-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.

Summary

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.

Why it matters now

EPSS 0.00407 35th percentileScored 2026-11-07

Fix Fixed Zoom Client for Meetings for Windows (Zoom Video Communications Inc): 5.5.4

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zoom Video Communications, Inc.	Zoom Client for Meetings for Windows	before 5.5.4	5.5.4	Patch available	CNA

Zoom Client for Meetings for Windows VendorZoom Video Communications, Inc. Affected before 5.5.4 Fixed in 5.5.4 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:zoom:zoom_client_for_meetings::::::windows::*	before 5.4.4	Vulnerable	Zoom Video Communications, Inc.

cpe:2.3:a:zoom:zoom_client_for_meetings:*:*:*:*:*:windows:*:* Versions before 5.4.4 Vulnerable ·Zoom Video Communications, Inc.

Remediation

Fix · CNA Zoom Client for Meetings for Windows (Zoom Video Communications Inc) Fixed in 5.5.4

Timeline

2026-10-02 Threatist record created from CVE-2021-34420
2026-10-03 Alias added: GHSA-xcgw-94hj-93r7

References

Advisory 2

TI-2021-13453 HTML injection in Zoom Linux client CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences