Microsoft Internet Explorer 5.01, 6, and 7 accesses uninitialized memory in certain conditions, which allows remote attackers to cause a denial of service (crash) and execute arbitrary code via vectors related to a document object "appended in a specific order" with "particular functions ... performed on" document objects, aka "HTML Objects Memory Corruption Vulnerability" or "Table Layout Memory Corruption Vulnerability," a different vulnerability than CVE-2008-2257.