[2020] EAC closes game due to security violation

Have you tried repairing it?

Go here,

C:\Program Files (x86)\Steam\steamapps\common\Warhammer Vermintide 2\installers\EasyAntiCheat

Then start the setup launcher

I have to ask - do you have either ASUS Aura Sync, RGB Fusion, iCUE or any other RGB controller running on your PC?

Thank you for the update!