CVE-2020-3966

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% 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-362

Description

VMware ESXi (7.0 before ESXi_7.0.0-1.20.16321839, 6.7 before ESXi670-202004101-SG and 6.5 before ESXi650-202005401-SG), Workstation (15.x before 15.5.2), and Fusion (11.x before 11.5.2) contain a heap-overflow due to a race condition issue in the USB 2.0 controller (EHCI). A malicious actor with local access to a virtual machine may be able to exploit this vulnerability to execute code on the hypervisor from a virtual machine. Additional conditions beyond the attacker's control must be present for exploitation to be possible.

Affected products

VMware Cloud Foundation: from 3.0 before 3.10; from 4.0.0 before 4.0.1 — fixed in 3.10, 4.0.1
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 (+167); 6.5, 6.7, 7.0.0
VMware Fusion: from 11.0.0 before 11.5.2 — fixed in 11.5.2
VMware Workstation: from 15.0.0 before 15.5.2 — fixed in 15.5.2
VMware ESXi: 7.0 before ESXi_7.0.0-1.20.16321839, 6.7 before ESXi670-202004101-SG, 6.5 before ESXi650-202005401-SG
VMware Fusion: 11.x before 11.5.2
VMware Workstation: 15.x before 15.5.2

How to fix

Upgrade to a fixed version: VMware Cloud Foundation 3.10, 4.0.1; VMware Fusion 11.5.2; VMware Workstation 15.5.2. Check the vendor advisory for mitigations.

References

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