VMSA-2020-0026 : VMware ESXi, Workstation and Fusion updates address use-after-free and privilege escalation vulnerabilities

high Nessus Plugin ID 143166


The remote VMware ESXi host is missing one or more security-related patches.


a. Use-after-free vulnerability in XHCI USB controller (CVE-2020-4004) VMware ESXi contains a use-after-free vulnerability in the XHCI USB controller. A malicious actor with local administrative privileges on a virtual machine may exploit this issue to execute code as the virtual machines VMX process running on the host.

b. VMX elevation-of-privilege vulnerability (CVE-2020-4005) VMware ESXi contains a privilege-escalation vulnerability that exists in the way certain system calls are being managed. A malicious actor with privileges within the VMX process only, may escalate their privileges on the affected system. Successful exploitation of this issue is only possible when chained with another vulnerability (e.g. CVE-2020-4004).


Apply the missing patches.

See Also


Plugin Details

Severity: High

ID: 143166

File Name: vmware_VMSA-2020-0026.nasl

Version: 1.6

Type: local

Published: 11/23/2020

Updated: 2/8/2024

Supported Sensors: Nessus

Risk Information


Risk Factor: Medium

Score: 6.5


Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2020-4005


Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2020-4004

Vulnerability Information

CPE: cpe:/o:vmware:esxi:6.5, cpe:/o:vmware:esxi:6.7, cpe:/o:vmware:esxi:7.0

Required KB Items: Host/local_checks_enabled, Host/VMware/release, Host/VMware/version

Exploit Ease: No known exploits are available

Patch Publication Date: 11/19/2020

Vulnerability Publication Date: 11/20/2020

Reference Information

CVE: CVE-2020-4004, CVE-2020-4005

IAVA: 2020-A-0544

VMSA: 2020-0026