This indicates an attack attempt to exploit a Buffer Overflow vulnerability in libmodplug before 0.8.8.4.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted S3M file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted S3M file.
libmodplug 0.8.8.4 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to the latest version of libmodplug (0.8.8.4 or later)