Vulnerable component: Microsoft Word
CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper input validation when processing URL within the Microsoft Windows Support Diagnostic Tool (MSDT). A remote unauthenticated attacker can trick the victim to open a specially crafted file, which calls the ms-msdt tool and execute arbitrary OS commands on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note, the vulnerability is being actively exploited in the wild.
The vulnerability resides within MSTD and not in Microsoft Word. Microsoft Word is an attack vector and not the source of vulnerability.