Please setup and harden vsftpd on this machine, do a system-wide scan for vulnerabilities, and do what you can to secure them
Setup:
sudo apt install -yvsftpd
System wide vulnerability scanning:
vulscan --system
Hardening:
1. Permissions (chmod 700) and disabling login without password:
2. Set default umask 022:
3. Enable logging:
4. Disable directory browsing:
5. Deny anonymous access to /tmp: