Microsoft · Security update · January 12, 2021

KB4598243: January 2021 cumulative update for Windows 10 1607

KB4598243, released January 12, 2021, fixes 55 CVEs across 7 products. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent1 publicly disclosed

CVEs closed

8 rated Critical

Exploited

None reported

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.0785

94th percentile

Priority of the 55 CVEs

Patch now 0
                                Urgent 9
                                High 36
                                Routine 10

Applies to

Product	Build after install
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems	14393.4169
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems	14393.4169
Microsoft Edge (EdgeHTML-based) on Windows Server 2016	14393.4169
Windows 10 Version 1607 for 32-bit Systems	14393.4169
Windows 10 Version 1607 for x64-based Systems	14393.4169
Windows Server 2016	14393.4169
Windows Server 2016 (Server Core installation)	14393.4169

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Urgent	CVE-2021-1665	Microsoft Graphics Component	Remote Code Execution	7.8	0.0406	Exploitation Less Likely
Urgent	CVE-2021-1668	Microsoft DTV-DVD Video Decoder	Remote Code Execution	7.8	0.0392	Exploitation Less Likely
Urgent	CVE-2021-1667	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0387	Exploitation Less Likely
Urgent	CVE-2021-1658	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0320	Exploitation Less Likely
Urgent	CVE-2021-1660	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0320	Exploitation Less Likely
Urgent	CVE-2021-1666	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0320	Exploitation Less Likely
Urgent	CVE-2021-1673	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0320	Exploitation Less Likely
Urgent	CVE-2021-1705	Microsoft Edge (HTML-based)	Remote Code Execution	4.2	0.0207	Exploitation Less Likely
Urgent	CVE-2021-1709	Microsoft Graphics Component	Elevation of Privilege	7.0	0.0079	More likely
High	CVE-2021-1692	Windows Hyper-V	Denial of Service	7.7	0.0424	Exploitation Less Likely
High	CVE-2021-1700	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0387	Exploitation Less Likely
High	CVE-2021-1701	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0387	Exploitation Less Likely
High	CVE-2021-1694	Windows Update Stack	Elevation of Privilege	7.5	0.0351	Exploitation Less Likely
High	CVE-2021-1710	Windows Media	Remote Code Execution	7.8	0.0322	Exploitation Less Likely
High	CVE-2021-1664	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0320	Exploitation Less Likely
High	CVE-2021-1669	Windows Remote Desktop	Security Feature Bypass	8.8	0.0320	Exploitation Less Likely
High	CVE-2021-1671	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0320	Exploitation Less Likely
High	CVE-2021-1674	Windows Remote Desktop	Security Feature Bypass	8.8	0.0320	Exploitation Less Likely
High	CVE-2021-1706	Microsoft Windows	Elevation of Privilege	7.3	0.0225	Exploitation Less Likely
High	CVE-2021-1648	Windows splwow64	Elevation of Privilege	7.8	0.0125	DisclosedExploitation Less Likely
High	CVE-2018-8455	Windows Kernel	Elevation of Privilege	7.0	0.0109	Exploitation Less Likely
High	CVE-2021-1704	Windows Hyper-V	Elevation of Privilege	7.3	0.0103	Exploitation Less Likely
High	CVE-2021-1657	Microsoft Windows	Remote Code Execution	7.8	0.0095	Exploitation Less Likely
High	CVE-2021-1685	Windows AppX Deployment Extensions	Elevation of Privilege	7.3	0.0094	Exploitation Less Likely
High	CVE-2021-1695	Windows Print Spooler Components	Elevation of Privilege	7.8	0.0087	Exploitation Less Likely

Released the same day

KB4486683
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
KB4486724
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
KB4486736
Excel Services on Microsoft SharePoint Enterprise Server 2013 Service Pack 1
KB4486755
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB4486759
Microsoft Office 2013 RT Service Pack 1, Microsoft Office 2013 Service Pack 1 (32-bit editions), Microsoft Office 2013 Service Pack 1 (64-bit editions)
KB4486762
Microsoft Office 2013 RT Service Pack 1, Microsoft Office 2013 Service Pack 1 (32-bit editions), Microsoft Office 2013 Service Pack 1 (64-bit editions)
KB4486764
Microsoft Word 2013 RT Service Pack 1, Microsoft Word 2013 Service Pack 1 (32-bit editions), Microsoft Word 2013 Service Pack 1 (64-bit editions)
KB4493142
Microsoft Office 2010 Service Pack 2 (32-bit editions), Microsoft Office 2010 Service Pack 2 (64-bit editions)
KB4493143
Microsoft Office 2010 Service Pack 2 (32-bit editions), Microsoft Office 2010 Service Pack 2 (64-bit editions)
KB4493145
Microsoft Word 2010 Service Pack 2 (32-bit editions), Microsoft Word 2010 Service Pack 2 (64-bit editions)
KB4493156
Microsoft Word 2016 (32-bit edition), Microsoft Word 2016 (64-bit edition)
KB4493160
Microsoft Office Online Server

Vendor advisory

https://support.microsoft.com/help/4598243

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