The vulnerability was used by APT28 team along with another zero-day CVE-2017-0263.
Vulnerable component: Microsoft Office
CVSSv3 score: CVSS:3.0/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-843 - Access of Resource Using Incompatible Type ('Type Confusion')
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a type confusion error when processing EPS wiles within Microsoft Office documents. A remote unauthenticated attacker can create a specially crafted document, trick the victim into opening it and execute arbitrary code on the target system with privileges of the current victim.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note: this vulnerability is being actively exploited in the wild.