Exploit kits using this vulnerability: Eleonore and Siberia.
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:F/RL:O/RC:C
CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
The vulnerability alows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to buffer overflow in the ActiveX control for the Snapshot Viewer for Microsoft Access. A remote attacker can construct a specially crafted Web page, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.
Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.
Note: this vulnerability was being actively exploited.