CVE-2020-3991: VMware Horizon Client

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

VMware Horizon Client for Windows (5.x before 5.5.0) contains a denial-of-service vulnerability due to a file system access control issue during install time. Successful exploitation of this issue may allow an attacker to overwrite certain admin privileged files through a symbolic link attack at install time. This will result into a denial-of-service condition on the machine where Horizon Client for Windows is installed.

Affected products

• VMware Horizon Client: from 5.0.0, before 5.5.0 (fixed in 5.5.0)

Published 2020-10-16. Last modified 2026-06-17.