The following steps will fix the issue where the blank shell input appears after running vagrant ssh on Windows 10:

This bug appears to be caused by a conflict between the ssh executable that comes with vagrant and the one that comes with Git Bash.

The problem can be solved by setting the VAGRANT_PREFER_SYSTEM_BIN environment variable to 1.

To do this, follow the below steps:
Step 1) Click Start and type “System” to open up the System menu within control panel.

Step 2) Click Advanced system settings from the System menu.

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Step 3) From the System Properties window, click on Environment Variables…

Step 4) Under System variables, select New… to add a new environment variable.

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Step 5) In the Variable name box, type VAGRANT_PREFER_SYSTEM_BIN and in the Variable value box enter 1 and click OK.

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Step 6) Close and re-open any Git Bash windows you have open, and re-run vagrant ssh.

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You should now be able to execute commands on you Vagrant server.