ModSecurity is an effective firewall for Apache web servers which is employed to stop attacks toward web applications. It monitors the HTTP traffic to a certain site in real time and prevents any intrusion attempts the instant it identifies them. The firewall uses a set of rules to do this - for example, attempting to log in to a script administrator area unsuccessfully many times sets off one rule, sending a request to execute a certain file that could result in accessing the Internet site triggers another rule, etc. ModSecurity is amongst the best firewalls available and it will protect even scripts which aren't updated regularly because it can prevent attackers from employing known exploits and security holes. Very comprehensive data about every intrusion attempt is recorded and the logs the firewall maintains are much more comprehensive than the standard logs provided by the Apache server, so you may later take a look at them and decide if you need to take additional measures so as to improve the protection of your script-driven sites.