Microsoft published updates for 39 vulnerabilities for Windows OS, Browsers and Office this December. The same trend of having under 100 vulnerabilities keeps on going.

This month there are not any publicly disclosed or already exploited vulnerabilities either. So in that sense this month is looking really good. According to Microsoft, there are a few critical updates and the highest CVSS rating goes up to 8.8 for Sharepoint Server vulnerability CVE-2020-17121. As a small exception also Office client products received quite a many updates for their vulnerabilities this patch Tuesday. CVSS ratings for these vulnerabilities stay under 8.

The impact and scoring of these and other vulnerabilities can be explored with Common Vulnerability Scoring System Calculator. Microsoft posts CVSS-calculator (maintained by National Vulnerability Database) links for all the vulnerabilities in their vulnerability articles. More thorough information of the vulnerabilities can be found from Microsoft’s MSRC-portal.

The known issues are pretty much the same as last month. Based on that information the administrators can still continue deploying the monthly patches following normal procedures.

Operating system

Known issues (last month)

Windows 10, version 20H2 and Windows Server, version 20H2


Windows 10, version 2004 and Windows Server, version 2004

2 (2)

Windows 10, version 1909 ja 1903* and Windows Server, version 1903

1 (1)

Windows 10, version 1809 and Windows Server 2019

0 (1)

Windows 10, version 1803**

0 (1)

Windows 10, version 1709** and Windows Server, version 1709

1 (1)

Windows 10, version 1703***

Reached end of service

Windows 10, version 1607 LTSC*** and Windows Server 2016

1 (1)

Windows 8.1**** and Windows Server 2012 R2

1 (1)

Windows Server 2012

1 (1)

Windows 7**** and Windows Server 2008 R2 SP1

2 (2)

* 1909 shares the same core and system files with the predecessor 1903.

** The support for the specific feature update for version Home and Pro has ended.

*** The support for the specific feature update for all the version has ended.

**** Mainstream support for the operating system has ended: Windows 8.1 1/10/2023 and Windows 7 1/14/2020.

If you have Sharepoint Server in your organization it might be smart to patch them quicker. Otherwise, the normal patching routines can be followed. However, Centero recommends to test the updates thoroughly before deploying them to production endpoints. In addition to this, all the known issues should be read through and reflected to own environment.

Microsoft maintains a list of Windows updates and their known issues on the following pages.

With Centero Software Manager Cloud and CSM Cloud for Servers it’s possible to deploy these updates into your environment and even on remote computers by the configuration you have defined.

Read more on this topic:

Comparing Patch Management solutions – Part 12/12 – Results

Our blog series, giving background on our Patch Management comparison, has now arrived to its last post, where we’ll look at the result summary.