Microsoft Internet Explorer 6 through 8 does not properly handle objects in memory in certain circumstances involving use of Microsoft Word to read Word documents, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka "Uninitialized Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6832
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-071