Remember when fail2ban had an RCE to execute things on a server via root user and it was as simple as parsing an email string because it was executing the mail

Remember when fail2ban had an RCE to execute things on a server via root user and it was as simple as parsing an email string because it was executing the mail binary on the other end? [1] That's pretty much the reason why I started to write my own guard tools. I don't need people from China or Russia logging in to my server. I don't understand why tools like this are never built in an ASN aware manner, blocking mechanisms would be so much easier. [1] https://research.securitum.com/fail2ban-remote-code-execution/ https://research.securitum.com/fail2ban-remote-code-executio...