This indicates an attempt to exploit a buffer overflow vulnerability in IBM Lotus Notes.
The vulnerability is due to a flaw in the "TagAttributeListCopy" function in "nnotes.dll". A remote attacker may exploit this to execute arbitrary code.
IBM Lotus Notes 7.0.2
IBM Lotus Notes 7.0.1
IBM Lotus Notes 6.5.3
IBM Lotus Notes 6.5.1
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to IBM Lotus Notes 7.0.3