Use-after-free vulnerability in Microsoft Internet Explorer 6, 7, and 8 allows remote attackers to execute arbitrary code via vectors related to Cascading Style Sheets (CSS) token sequences and the clip attribute, aka an "invalid flag reference" issue or "Uninitialized Memory Corruption Vulnerability," as exploited in the wild in November 2010.
https://exchange.xforce.ibmcloud.com/vulnerabilities/62962
http://www.us-cert.gov/cas/techalerts/TA10-348A.html
http://www.kb.cert.org/vuls/id/899748
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12279
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-090
http://www.symantec.com/connect/blogs/new-ie-0-day-used-targeted-attacks
http://www.microsoft.com/technet/security/advisory/2458511.mspx
http://blogs.technet.com/b/msrc/archive/2010/11/02/microsoft-releases-security-advisory-2458511.aspx