Microsoft Internet Explorer 6 through 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing a deleted object, aka "VML Style Remote Code Execution Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15550
https://exchange.xforce.ibmcloud.com/vulnerabilities/74383
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-023