RealNetworks Helix Server and Helix Mobile Server before 13.0.0 allow remote attackers to cause a denial of service (daemon crash) via an RTSP SETUP request that (1) specifies the / URI or (2) lacks a / character in the URI.
http://www.vupen.com/english/advisories/2009/1947
http://www.securityfocus.com/bid/35732
http://www.securityfocus.com/archive/1/505083/100/0/threaded
http://www.exploit-db.com/exploits/9198
http://docs.real.com/docs/security/SecurityUpdate071409HS.pdf