Microsoft has published security advisories, to address remote code execution vulnerabilities in Microsoft defender on 12th January, 2021.
The Guyana National CIRT recommends that users and administrators review these updates and apply them where necessary.
For more information on Microsoft Defender updates you can follow the URL:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647
PDF Download: Microsoft Defender Remote Code Execution (RCE) Vulnerability.pdf
References
Microsoft Security Update Guide (12th, January, 2021). Retrieved from Microsoft
https://msrc.microsoft.com/update-guide/vulnerability
RCE Vulnerability Affecting Microsoft Defender (14th January,2021). Retrieved from US.Cert, CISA