Microsoft Internet Explorer 5.5 SP1 Security Update Malformed vCard

From Microsoft:

This update resolves the "Malformed vCard" security vulnerability in Outlook and Outlook Express. This vulnerability exists because the component in Outlook and Outlook Express that processes the vCard (virtual business card) has an unchecked buffer (a temporary data storage area without a string length limit). A malicious user can exploit this vulnerability by creating a vCard that contains specially malformed data, and sending it to another user. When the recipient opens the vCard, the data overruns the buffer. This causes the e-mail program to stop functioning until it is restarted. In a more serious case, a malicious user could exploit the unchecked buffer to run unauthorized on the other user's computer. Download now to ensure that your e-mail service processes vCards correctly.