The exploit code was revealed after Hacking Team data leak.
Advisory: SB2015071401 - Multiple vulnerabilities in Microsoft Internet Explorer
Vulnerable component: Microsoft Internet Explorer
CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-119 - Memory corruption
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to boundary error. A remote attacker can create a specially crafted Web-site, trick the victim into visiting it, trigger memory corruption and execute arbitrary code with privileges of the current user.
Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.
Note: the vulnerability was being actively exploited.