CVE-2020-3961

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-06-15 · updated 2026-06-17
Weakness: CWE-732

Description

VMware Horizon Client for Windows (prior to 5.4.3) contains a privilege escalation vulnerability due to folder permission configuration and unsafe loading of libraries. A local user on the system where the software is installed may exploit this issue to run commands as any user.

Affected products

VMware Horizon Server: before 5.4.3 — fixed in 5.4.3
VMware Horizon Client for Windows: VMware Horizon Client for Windows (prior to 5.4.3)

How to fix

Upgrade to a fixed version: VMware Horizon Server 5.4.3. Check the vendor advisory for mitigations.

References

https://www.vmware.com/security/advisories/VMSA-2020-0013.html
https://www.vmware.com/security/advisories/VMSA-2020-0013.html

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