This is a cumulative patch that includes the functionality of all previously released patches for Internet Explorer 5.01 SP3. In addition, it eliminates six newly discovered vulnerabilities which include a buffer overrun vulnerability that occurs because Internet Explorer does not correctly check the parameters of a PNG graphics file when it is opened, an information disclosure vulnerability, a vulnerability that occurs because under certain circumstances Internet Explorer does not correctly check the component that the OBJECT tag calls, and three vulnerabilities resulting from incomplete security checks.

For more information about the vulnerabilities this update addresses, read the associated Microsoft Security Bulletin.