CVE-2020-3989

Severity: low (CVSS 3.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-09-16 · updated 2026-06-17
Weakness: CWE-787

Description

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 Server: 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
VMware Workstation and Horizon Client for Windows: VMware Workstation (15.x), Horizon Client for Windows (5.x before 5.4.4)

How to fix

Upgrade to a fixed version: VMware Horizon Server 5.4.4; VMware Workstation Player 16.0.0; VMware Workstation Pro 16.0.0. Check the vendor advisory for mitigations.

References

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