You're looking for information on a vsftpd 2.0.8 exploit. Vsftpd (Very Secure FTP Daemon) is a popular FTP server used in many Linux distributions.
Patch
The exploit you're referring to is likely the one disclosed in 2011, which allows for a remote denial of service (DoS) or potentially even remote code execution. vsftpd 2.0.8 exploit github
Metasploit: A dedicated module, unix/ftp/vsftpd_234_backdoor, remains one of the most used tools for demonstrating this flaw. 🔍 Vulnerabilities in Other Versions You're looking for information on a vsftpd 2