SlyfeR

Hello, I'm a staff member in a known CS 1.6 community and 1 of our servers is experiencing attacks that could change the player's names, set the sensivity to highest, making some messages appear on the screen or unbinding all keybind and then crashing the server. Does anyone know what this attack could be? How is it done and how to solve it? We haven't found a solution yet. The servers are VAC protected btw. image.jpg