This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
This signature detects an attempt to exploit a vulnerability in Internet Explorer which may result in remote code execution.
A remote code execution vulnerability exists in Internet Explorer due to attempts to access uninitialized memory in certain situations. An attacker could exploit the vulnerability by constructing a specially crafted Web page. When a user views the Web page, the vulnerability could allow remote code execution. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2008-4259.
Download and install all vendor patches related to this vulnerability.