ModSecurity is a powerful firewall for Apache web servers that is used to stop attacks towards web apps. It keeps track of the HTTP traffic to a certain website in real time and prevents any intrusion attempts the instant it discovers them. The firewall relies on a set of rules to do this - as an illustration, attempting to log in to a script admin area without success a few times sets off one rule, sending a request to execute a certain file which may result in gaining access to the website triggers a different rule, and so on. ModSecurity is amongst the best firewalls available on the market and it will secure even scripts that are not updated regularly as it can prevent attackers from employing known exploits and security holes. Very comprehensive information about each and every intrusion attempt is recorded and the logs the firewall maintains are a lot more specific than the standard logs created by the Apache server, so you may later take a look at them and decide whether you need to take more measures so as to increase the protection of your script-driven Internet sites.