Microsoft Internet Explorer 5.01 SP4, 6 SP1, 6 and 7 on Windows XP SP2 and SP3, 6 and 7 on Windows Server 2003 SP1 and SP2, 7 on Windows Vista Gold and SP1, and 7 on Windows Server 2008 allows remote attackers to execute arbitrary code via a web page that triggers presence of an object in memory that was (1) not properly initialized or (2) deleted, aka "Uninitialized Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5723
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-014
http://www.vupen.com/english/advisories/2009/1028
http://www.us-cert.gov/cas/techalerts/TA09-104A.html
http://www.securitytracker.com/id?1022042
http://support.avaya.com/elmodocs2/security/ASA-2009-133.htm