---
title: "CVE-2018-3646"
description: "- Connect to the vCenter Server using either the vSphere Web or vSphere Client. - Select an ESXi host in the inventory. - Click the **Manage** (5.5/6.0) or **Configure** (6.5/6.7) tab. - Click the **Settings** sub-tab. - Under the System heading, click **Advanced System Settings**. - Click in…"
url: "https://kellej.hu/docs/cve-2018-3646/"
updated: "2026-04-16"
category: ESXi
---

# CVE-2018-3646

- Connect to the vCenter Server using either the vSphere Web or vSphere Client.
- Select an ESXi host in the inventory.
- Click the **Manage** (5.5/6.0) or **Configure** (6.5/6.7) tab.
- Click the **Settings** sub-tab.
- Under the System heading, click **Advanced System Settings**.
- Click in the Filter box and search **VMkernel.Boot.hyperthreadingMitigation**
- Select the setting by name and click the Edit pencil icon.
- Change the configuration option to true (default: false).
- Click OK.
- Reboot the ESXi host for the configuration change to go into effect.

 

- Connect to the host using SSH
- Check the current runtime value of the HTAware Mitigation Setting by running: 
  ```
  esxcli system settings kernel list -o hyperthreadingMitigation
  ```
- Enable HT Aware Mitigation by running: 
  ```
  esxcli system settings kernel set -s hyperthreadingMitigation -v TRUE
  ```
- Reboot the ESXi Host.