This indicates an attack attempt to exploit one of multiple Integer Overflow vulnerabilities in Nullsoft Winamp.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted .AVI file with a malformed chunk structure or stream value. As a result, a remote attacker may be able to execute arbitrary code within the context of the application, via a crafted AVI file.
Nullsoft Winamp 5.622 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems
Apply patch available from the website.