Use-after-free vulnerability in Microsoft Internet Explorer 6 and 7 allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, aka "Layouts Handling Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12463
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-018
http://www.us-cert.gov/cas/techalerts/TA11-102A.html
http://www.securitytracker.com/id?1025327
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=900