Vulnerable component: Microsoft Active Template Library
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
CWE-ID: CWE-665 - Improper Initialization
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to improper initialization in the Microsoft Active Template Library (ATL) when handling objects from data streams related to unsafe usage of OleLoadFromStream() function. A remote attacker can create a specially crafted Web site that instantiates a vulnerable component or control using the IE browser, trick the victim into viewing it 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: the vulnerability was being actively exploited.