CVE-2021-34420

Zoom Windows installation executable signature bypass

HIGH
7.4
CVSS Score
Published: November 11, 2021 at 10:59 PM UTC
Updated: June 17, 2026 at 03:55 AM UTC
2 products affected across 2 vendorsZoom Client for MeetingsZoom Client for Meetings

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Severity
HIGH7.4
Exploit prediction
EPSS 0.4%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 5.4.4
Affected range stops below 5.4.4, so it looks safe — our inference, not a vendor statement
v < 5.5.4
Affected range stops below 5.5.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-347

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