A basic script that exploits CVE-2011-2523
In 2011, an integrated backdoor was found on vsFTPd servers running version 2.3.4, in which using a smiley emoticon ":)" triggers a reverse connection to an attacker. With this, it is extremely easy to create an exploit script and gain access to a system vulnerable to this flaw. By using said emoticon during authentication, the backdoor is triggered, and the attacker can then connect to the shell on port 6200.
Just run Python with the exploit.py file. Make sure Pwntools is installed first using Pip.