CVE-2020-3989: VMware Horizon Client

Low severity, CVSS 3.3. EPSS: 0.3% chance of exploitation in the next 30 days.

VMware Workstation (15.x) and Horizon Client for Windows (5.x before 5.4.4) contain a denial of service vulnerability due to an out-of-bounds write issue in Cortado ThinPrint component. A malicious actor with normal access to a virtual machine may be able to exploit this issue to create a partial denial-of-service condition on the system where Workstation or Horizon Client for Windows is installed. Exploitation is only possible if virtual printing has been enabled. This feature is not enabled by default on Workstation but it is enabled by default on Horizon Client.

Affected products

• VMware Horizon Client: from 5.0.0, before 5.4.4 (fixed in 5.4.4)
• VMware Workstation Player: from 15.0.0, before 16.0.0 (fixed in 16.0.0)
• VMware Workstation Pro: from 15.0.0, before 16.0.0 (fixed in 16.0.0)

Published 2020-09-16. Last modified 2026-06-17.