This indicates an exploit attempt against a Buffer Overflow vulnerability in various media player.
The vulnerability allows remote attackers to execute arbitrary code via a "m3u" or "pls" file containing an overly long line. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted file.
Nullsoft Winamp 5.094 and 5.12
Apple iTunes 4.7
Apple iTunes before 9.0.1
KUDRSOFT AudioPLUS 188.8.131.52
Sony SonicStage CONNECT Player (CP) 4.3
COWON America jetAudio Basic 7.0.3
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.