The Microsoft (1) VBScript 5.7 and 5.8 and (2) JScript 5.7 and 5.8 engines, as used in Internet Explorer 8 through 11 and other products, allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted replace operation with a JavaScript regular expression, aka "Scripting Engine Memory Corruption Vulnerability."
https://www.exploit-db.com/exploits/40798/
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-108
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-106
http://www.zerodayinitiative.com/advisories/ZDI-15-515