ModSecurity is a potent web application layer firewall for Apache web servers. It monitors the whole HTTP traffic to a website without affecting its operation and when it identifies an intrusion attempt, it prevents it. The firewall additionally keeps a more comprehensive log for the site visitors than any web server does, so you'll manage to keep an eye on what is happening with your websites a lot better than if you rely only on standard logs. ModSecurity employs security rules based on which it stops attacks. For instance, it detects if someone is attempting to log in to the admin area of a specific script multiple times or if a request is sent to execute a file with a certain command. In such situations these attempts trigger the corresponding rules and the firewall software hinders the attempts in real time, and then records comprehensive information about them inside its logs. ModSecurity is among the best software firewalls on the market and it can easily protect your web apps against a large number of threats and vulnerabilities, particularly if you don’t update them or their plugins frequently.