BEA WebLogic Server and WebLogic Express 8.1 SP5 and earlier, and 7.0 SP6 and earlier, when using username/password authentication, does not lock out a username after the maximum number of invalid login attempts, which makes it easier for remote attackers to guess the password.
http://www.securityfocus.com/bid/17168
http://www.securityfocus.com/bid/15052
http://secunia.com/advisories/17138