I don't know how many are informed about the KRACK vulnerability of WPA/WPA2. Have a look here:
https://www.cnet.com/how-to/krack-affects-everyone-heres-what-to-do-now/
Microsoft October security patches for Windows 7, 8.1 and 10 are addressing this issue. For Windows 8 I used the Windows 8 embedded October security patch (which must be the same for the Windows Server 2012 one, at least they are reported to have the same size in the Microsoft Update Catalog).