There has been a lot of attention given to brute force attacks against WordPress, Joomla and other web-based applications. A rising security threat that hasn't gotten nearly as much attention is brute force router hacks. Yes, it's possible for your wireless router to be hacked. It is, after all, just a little computer that sits between your personal computer and the Internet.
There is a well organized global attack on WordPress sites going on that is attempting to crack WordPress passwords by brute force. This means that automated scripts are attempting to log in to any WordPress site they find by trying every combination of passwords they can generate. Given the power of the typical computer these days, this means thousands of attempts per minute. As you might imagine, this puts a tremendous load on the server, especially those with hundreds of WordPress installations which describes most shared hosting servers.