This indicates an attempt to exploit a memory corruption vulnerability in Microsoft Internet Explorer (IE).
This vulnerability is due to inadequate validation of the arguments provided to the "SetExpression()" function. It may allow remote attackers to execute arbitrary code in the context of IE. Failed exploit attempts will likely cause IE to crash, resulting in a denial of service condition.
Internet Explorer 5.01
Internet Explorer 6
Internet Explorer 6 Service Pack 1
System Compromise: remote attackers can gain control of vulnerable systems.
Refer to the vendor's web site for suggested workaround.