CVE-2020-3951: VMware Horizon Client

Low severity, CVSS 3.8. EPSS: 0.3% chance of exploitation in the next 30 days.

VMware Workstation (15.x before 15.5.2) and Horizon Client for Windows (5.x and prior before 5.4.0) contain a denial-of-service vulnerability due to a heap-overflow issue in Cortado Thinprint. Attackers with non-administrative access to a guest VM with virtual printing enabled may exploit this issue to create a denial-of-service condition of the Thinprint service running on the system where Workstation or Horizon Client is installed.

Affected products

• VMware Horizon Client: from 5.0.0, before 5.4.0 (fixed in 5.4.0)
• VMware Workstation: from 15.0.0, before 15.5.2 (fixed in 15.5.2)

Published 2020-03-17. Last modified 2026-06-17.