Most of the time, using VM technology will increase overall security risk. VMs have the same security risks as physical computers. Some of the vulnerabilities occur in the VM software layer without the additional features needed. Security assessments against multiple virtual machine technologies have revealed multiple vulnerabilities in these areas, and practically, these risks will always be there. They’re inherent in the model. Good VM security practices include: Treat and secure your VM sessions as thoroughly as you do each physical machine under your control, or even consider stronger.”]
Source: https://www.csoonline.com/article/2633088/virtual-machines-aren-t-really-more-secure.html