The default configuration of the Windows binary release of MySQL 3.23.2 through 3.23.52 has a NULL root password, which could allow remote attackers to gain unauthorized root access to the MySQL database.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-1788
http://www.securityfocus.com/bid/5503
http://www.iss.net/security_center/static/9902.php
http://archives.neohapsis.com/archives/bugtraq/2002-08/0185.html