Multiple buffer overflows in RealNetworks Helix Server and Helix Mobile Server 11.x before 11.1.8 and 12.x before 12.0.1 allow remote attackers to (1) cause a denial of service via three crafted RTSP SETUP commands, or execute arbitrary code via (2) an NTLM authentication request with malformed base64-encoded data, (3) an RTSP DESCRIBE command, or (4) a DataConvertBuffer request.
http://www.vupen.com/english/advisories/2008/3521
http://www.securitytracker.com/id?1021501
http://www.securitytracker.com/id?1021500
http://www.securitytracker.com/id?1021499
http://www.securitytracker.com/id?1021498
http://secunia.com/advisories/33360
http://docs.real.com/docs/security/SecurityUpdate121508HS.pdf