external drive on hyper-v

hello guys, if i use an external drive as vhd for a virtual machine in hyper-v and the virtual machine would be  on 24 hours and all year round. 

And it will be used as an ftp server. Therefore, it will be connected to the outside world.

Of course not ideal, but need to save cost.

Question is:

 If let's say the Virtual machine will get compromised, will the attacker gain access to the host system?

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