There is a command tab completion vulnerability in minecraft (there will be no instructions on how to use the exploit in order to maintain security) , which is capable of crashing almost any server up to 1.20.4 (the exploit was fixed in the latest builds of Paper 1.20.4)

Example error in the console:

The plugin is called to help solve this problem (at least try)
(The plugin has not been tested on versions lower than 1.16.5 (maybe it works there too))

Installation:
The plugin is cross-platform (Supports: spigot, paper, bungee, velocity)

Spigot/Paper
If you have 1 or more spigot/paper servers, install the plugin in the plugins folder on all your spigot/paper servers

Bungeecord/Velocity
If you have a proxy core, install the plugin in the plugins folder(s) only for the proxy core(s)

Feedback:
If you need to contact me - my discord: kepchyk1101
(Ukrainian)​