Unspecified vulnerability in the CTableCol::OnPropertyChange method in Microsoft Internet Explorer 5.01 SP4 on Windows 2000 SP4; 6 SP1 on Windows 2000 SP4; and 6 on Windows XP SP2, or Windows Server 2003 SP1 or SP2 allows remote attackers to execute arbitrary code by calling deleteCell on a named table row in a named table column, then accessing the column, which causes Internet Explorer to access previously deleted objects, aka the "Uninitialized Memory Corruption Vulnerability."