The vulnerability reffers to the APT28 and Operation Pawn Storm and was used in cyber espionage campaign by Tsar Team.
Advisory: SB2015063001 - Remote code execution in Microsoft Office
Vulnerable component: Microsoft Office
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-122 - Heap-based Buffer Overflow
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to heap-based buffer overflow when processing Office files. A remote attacker can create a specially crafted Office file, trick the victim into opening it, cause memory corruption and execute arbitrary code with privileges of the current user.
Successful exploitation of this vulnerability results in arbitrary code execution on the vulnerable system.
Note: the vulnerability was being actively exploited.