source: http://www.securityfocus.com/bid/25816/info

Microsoft Windows Explorer is prone to a denial-of-service vulnerability because it fails to handle malformed PNG image files.

Attackers can exploit this issue to cause Windows Explorer to exhaust CPU cycles and become unresponsive.

https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/30619.png