Equation Editor in Microsoft Office 2007, Microsoft Office 2010, Microsoft Office 2013, and Microsoft Office 2016 allows a remote code execution vulnerability due to the way objects are handled in memory, aka "Microsoft Office Memory Corruption Vulnerability".
http://www.securityfocus.com/bid/102370
http://www.securitytracker.com/id/1040153
https://0patch.blogspot.com/2018/01/bringing-abandoned-equation-editor-back.html
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0798
Source: MITRE
Published: 2018-01-10
Updated: 2020-08-24
Type: CWE-787
Base Score: 9.3
Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 8.6
Severity: HIGH
Base Score: 8.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.8
Severity: HIGH