This indicates an attack attempt against a buffer-overflow vulnerability in RealNetworks Helix Server.
The vulnerability is caused by an error when the vulnerable software handles a specially crafted RTSP request. It allows a remote attacker to execute arbitrary code.
Helix Server versions 11.x
Helix Server versions 12.x
Helix Mobile Server versions 11.x
Helix Mobile Server versions 12.x
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to Helix Server and Helix Mobile Server version 11.1.8 or 12.0.1: