Kick exploits

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Kick exploits are exploits in the Java Edition protocol implementation or game logic implementation that can be abused to disconnect a client from the server.

Serverside

Serverside kicks force the server to disconnect a client.

Oversized packets

Oversized packets are achieved by making the server generate a packet that is too large for it to encode, resulting in the server disconnecting the player.

Such exploits have since been largely patched by PaperMixins[1].

ViaVersion kick exploits

ViaVersion kick exploits are occasionally the result of ViaVersion bugs, but are usually caused by oversized packet kicks.

Clientside

Clientside exploits cause unpatched clients to disconnect from the server.

Long commands in command blocks

When a client opens a command block that contains a large command inside, and attempts to request a completion for it (always done for legacy commands like /sudo), it can be too large for the server to accept and the server will kick the player.

References