This indicates an attack attempt against a Memory Corruption vulnerability in Novell GroupWise Internet Agent.
The vulnerability is caused by an error when the vulnerable software handles an "iCal" file that includes a malicious parameter. It may allow remote attackers to execute arbitrary code by sending a crafted "iCal" file.
Novell Groupwise prior to 8.02 HP3
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply fixes or patches from the vendor, available from the website: