mysql bug post : http://bugs.mysql.com/bug.php?id=64884
Today rapid7 team released a tool to scan possible vulnerabilities in your network , that tool is free of cost and work on windows you can more detail and download link for tool in blog post .
if you already use metasploit framework or metasploit pro then you can use an auxiliary module to search in network for this vulnerability
msf > use auxiliary/scanner/mysql/mysql_authbypass_hashdump
use this tool to check and update mysql version is best way to prevent any attack