This indicates an attack attempt against a buffer overflow vulnerability in VLC Media Player.
The vulnerability is caused by an error when the vulnerable software handles a malicious .mp4 file. It allows a remote attacker to execute arbitrary code via sending a crafted .mp4 file.
VLC Media Player version 1.0.1 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply patch, available from the web site.