# MA-820.102021: MyCERT Advisory - Microsoft October 2021 Security Updates

**Date:** 18 Oct 2021  
**Source:** https://www.mycert.org.my/portal/advisory?id=MA-820.102021  
**Advisory ID:** MA-820.102021

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**1.0 Introduction**
Microsoft has released updates to address multiple vulnerabilities in Microsoft software. This month’s security update notification presents 12 newly reported vulnerabilities, where 6 have been rated critical while the remaining classified as important.
**2.0 Impact**
A remote attacker could exploit some of these vulnerabilities to take control of an affected system.
**3.0 Affected Products**
Windows 11    
Windows Server 2022    
Windows 10 v21H1, v20H2, v2004, and v1909    
Windows Server 2019, Windows Server 2016, and Server Core installations (2019, 2016, v20H2, and v2004)    
Windows 8.1, Windows Server 2012 R2, and Windows Server 2012
Microsoft Office 
Microsoft SharePoint
Microsoft Exchange Server
Microsoft .NET
Microsoft Visual Studio
Microsoft Dynamics 365
Microsoft System Center
**4.0 Recommendations**
Users and administrators are recommended to review the below URLs and perform necessary update. Kindly refer to the below URL:
<https://msrc.microsoft.com/update-guide/deployments>
<https://msrc.microsoft.com/update-guide/releaseNote/2021-Oct>
Generally, MyCERT advises the users of this devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.
For further enquiries, please contact MyCERT through the following channels:
E-mail: cyber999[at]cybersecurity.my
Phone: 1-300-88-2999 (monitored during business hours)
Mobile: +60 19 2665850 (24x7 call incident reporting)
Business Hours: Mon - Fri 09:00 -18:00 MYT
Web: <https://www.mycert.org.my>
Twitter: <https://twitter.com/mycert>
Facebook: <https://www.facebook.com/mycert.org.my>
**5.0    References**
- <https://us-cert.cisa.gov/ncas/current-activity/2021/10/12/microsoft-releases-october-2021-security-updates>
- <https://msrc.microsoft.com/update-guide/deployments>
- <https://msrc.microsoft.com/update-guide/releaseNote/2021-Oct>