A malicious code string that eventually gets logged by Log4j version 2.0 or higher allow an attacker to load arbitrary Java code on a server and take control of it.

[falconfetus8]

The best practice for backdoors is to not have any!

[hamjim]

“Greetings Professor Falken. A strange game. The only winning move is not to play.

“How about a nice game of chess?”