Geek.com: PSN was running on unpatched Apache server with no firewall

The issue reported was the fact Sony was running PSN on a server that had an outdated version of Apache and no firewall in place. That meant any vulnerabilities known about for that version of Apache, and patched in more up-to-date releases, were easy to take advantage of. With no firewall in place too, the hacker probably had a very easy time of it.