Microsoft Internet Explorer 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 does not properly handle transition errors in a request for one HTTP document followed by a request for a second HTTP document, which allows remote attackers to execute arbitrary code via vectors involving (1) multiple crafted pages on a web site or (2) a web page with crafted inline content such as banner advertisements, aka "Page Transition Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6164
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.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=871138
http://support.avaya.com/elmodocs2/security/ASA-2009-133.htm