CVE-2020-3971

Severity: medium (CVSS 5.5 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: 2020-06-25 · updated 2026-06-17
Weakness: CWE-787

Description

VMware ESXi (6.7 before ESXi670-201904101-SG and 6.5 before ESXi650-201907101-SG), Workstation (15.x before 15.0.2), and Fusion (11.x before 11.0.2) contain a heap overflow vulnerability in the vmxnet3 virtual network adapter. A malicious actor with local access to a virtual machine with a vmxnet3 network adapter present may be able to read privileged information contained in physical memory.

Affected products

VMware Cloud Foundation: from 3.0 before 3.7.2 — fixed in 3.7.2
VMware ESXi: 6.5-650-201701001, 6.5-650-201703001, 6.5-650-201703002, 6.5-650-201704001, 6.5-650-201707101, 6.5-650-201707102 (+83); 6.5, 6.7
VMware Fusion: from 11.0.0 before 11.0.2 — fixed in 11.0.2
VMware Workstation: from 15.0.0 before 15.0.2 — fixed in 15.0.2
VMware ESXi: 6.7 before ESXi670-201904101-SG, 6.5 before ESXi650-201907101-SG
VMware Fusion: 11.x before 11.0.2
VMware Workstation: 15.x before 15.0.2

How to fix

Upgrade to a fixed version: VMware Cloud Foundation 3.7.2; VMware Fusion 11.0.2; VMware Workstation 15.0.2. Check the vendor advisory for mitigations.

References

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