Exception Spamming

There is a hacked client going by the name of Wurst that has found an exploit to send multiple exception errors at once to servers. This is a problem as it not only spams the server's logs but also creates an immense amount of connection lag on the server.

I am not sure myself of how it works, but I would assume that it executes exploits or series of moves considered illegal for the player that ends up listing the exception errors in logs. Here is a pastebin containing some of the errors. http://pastebin.com/TfvZt4U2

To test this for yourselves on the hacked client, you will have to install the Wurst client found here https://www.wurstclient.net/news/2017-03-10-Wurst-5.10/ , the source code is also available if that could help find what they have the client do in order to reproduce the exceptions. Placing the folder inside of the versions folder and running Minecraft from that version will launch you into the Wurst hacked client. Going on any server, clicking Ctrl to open the GUI, and typing in 'log' will bring up LogSpammer. Enabling that will start the exception errors in the logs.

I understand if you do not want to download and run the client for yourselves, but the source code as well as the pastebin are available for you to investigate and further patch if it is possible to.