This cumulative update includes all of the updates that have been released for Internet Information Server (IIS) 4.0 since the release of Windows NT 4.0 Service Pack 5, including two new updates. Download now to keep IIS 4.0 updated with the latest security fixes. This update eliminates two new security vulnerabilities: A denial of service vulnerability that could cause IIS 4.0 to stop responding. This vulnerability can be exploited by the 'Code Red' worm. A security vulnerability that could enable a malicious user to gain unauthorized privileges on your Web server.