CVE-2020-3999: VMware ESXi

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

VMware ESXi (7.0 prior to ESXi70U1c-17325551), VMware Workstation (16.x prior to 16.0 and 15.x prior to 15.5.7), VMware Fusion (12.x prior to 12.0 and 11.x prior to 11.5.7) and VMware Cloud Foundation contain a denial of service vulnerability due to improper input validation in GuestInfo. A malicious actor with normal user privilege access to a virtual machine can crash the virtual machine's vmx process leading to a denial of service condition.

Affected products

• VMware ESXi: version 7.0 only
• VMware Fusion: from 11.5.0, before 11.5.7 (fixed in 11.5.7)
• VMware Workstation: from 15.0.0, before 15.5.7 (fixed in 15.5.7)

Published 2020-12-21. Last modified 2026-06-17.