Microsoft · Security update · January 14, 2020

KB4535104: January 2020 security update

KB4535104, released January 14, 2020, fixes 3 CVEs across 19 products. One of them is being exploited (CVE-2020-0646); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEV

CVEs closed

3 rated Critical

Exploited

CVE-2020-0646

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.9922

99th percentile

Priority of the 3 CVEs

Patch now 1
                                Urgent 2
                                High 0
                                Routine 0

Applies to

Product
Microsoft .NET Framework 3.5 on Windows 8.1 for 32-bit systems
Microsoft .NET Framework 3.5 on Windows 8.1 for x64-based systems
Microsoft .NET Framework 3.5 on Windows Server 2012 R2
Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation)
Microsoft .NET Framework 4.5.2 on Windows 8.1 for 32-bit systems
Microsoft .NET Framework 4.5.2 on Windows 8.1 for x64-based systems
Microsoft .NET Framework 4.5.2 on Windows RT 8.1
Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2
Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 (Server Core installation)
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for x64-based systems
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows RT 8.1
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation)
Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems
Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems
Microsoft .NET Framework 4.8 on Windows RT 8.1
Microsoft .NET Framework 4.8 on Windows Server 2012 R2
Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2020-0646	.NET Framework	Remote Code Execution	n/a	0.9922	KEVExploited
Urgent	CVE-2020-0605	.NET Framework	Remote Code Execution	n/a	0.1840	Exploitation Less Likely
Urgent	CVE-2020-0606	.NET Framework	Remote Code Execution	n/a	0.1834	Exploitation Less Likely

Released the same day

KB4484217
Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition)
KB4484221
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB4484223
Office Online Server
KB4484227
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)
KB4484234
Microsoft Excel 2013 RT Service Pack 1, Microsoft Excel 2013 Service Pack 1 (32-bit editions), Microsoft Excel 2013 Service Pack 1 (64-bit editions)
KB4484236
Microsoft Office 2010 Service Pack 2 (32-bit editions), Microsoft Office 2010 Service Pack 2 (64-bit editions)
KB4484243
Microsoft Excel 2010 Service Pack 2 (32-bit editions), Microsoft Excel 2010 Service Pack 2 (64-bit editions)
KB4528760
Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems, Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems, Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems and 11 more
KB4532933
Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server 2016 and 1 more
KB4532935
Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems
KB4532936
Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation)
KB4532938
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems and 3 more

Vendor advisory

https://support.microsoft.com/help/4535104

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