CVE-2020-3951

Severity: low (CVSS 3.8 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: 2020-03-17 · updated 2026-06-17
Weakness: CWE-787

Description

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 Server: 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
VMware Workstation and Horizon Client for Windows: VMware Workstation (15.x before 15.5.2) and Horizon Client for Windows (5.x and prior before 5.4.0)

How to fix

Upgrade to a fixed version: VMware Horizon Server 5.4.0; VMware Workstation 15.5.2. Check the vendor advisory for mitigations.

References

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