This indicates an attack attempt against a buffer overflow vulnerability in Real Networks RealPlayer.
This issue is caused by an error in vidplin.dll when handling a malformed "AVI" file. It may allow remote attackers to execute arbitrary code by sending a crafted "AVI" file.
RealNetworks RealPlayer 11.0 through 11.1 and 14.0.x before 14.0.2
RealPlayer SP 1.0 through 1.1.5
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to the vendor web site for suggested workaround.