This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Internet Explorer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the CCommand::Exec function. It is possible to free certain objects in a callback function called from the CCommand::Exec function. Upon return from this function a local variable is being re-used without check. This can lead to a use-after-free issue that can result in remote code execution under the context of the current process.