Multiple stack-based buffer overflows in Now SMS/MMS Gateway 2007.06.27 and earlier allow remote attackers to execute arbitrary code via a (1) long password in an Authorization header to the HTTP service or a (2) large packet to the SMPP service.
https://www.exploit-db.com/exploits/5695
http://www.vupen.com/english/advisories/2008/0615
http://www.securityfocus.com/archive/1/488365/100/100/threaded