Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability," a different vulnerability than CVE-2015-1735, CVE-2015-1740, CVE-2015-1744, and CVE-2015-1766.
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-056
http://www.zerodayinitiative.com/advisories/ZDI-15-252