WordPress Firewall 2 plugin by pavy and seoegghead monitors web requests to identify and stop the most obvious attacks..
This is an updated version of the popular WordPress Firewall plugin, with fixes for all known bugs and a few new features!
This WordPress plugin investigates web requests with simple, WordPress-specific heuristics, to identify and stop the most obvious attacks. There are a few powerful, generic modules that do this; but they’re not always installed on web servers, and usually difficult to configure.
This plugin intelligently whitelists and blacklists pathological-looking phrases, based on which field they appear within, in a page request (unknown/numeric parameters vs. known post bodies, comment bodies, etc.). Its purpose is not to replace prompt and responsible upgrading, but rather to mitigate 0-day attacks and let bloggers sleep better at night.
Originally developed by SEO Egghead and released as WordPress Firewall.