Microsoft · Security update · October 12, 2021

KB5006670: October 2021 cumulative update for Windows 10 2004

KB5006670, released October 12, 2021, fixes 46 CVEs across 11 products. 3 of them are being exploited (CVE-2021-40449); 3 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now3 on CISA KEVKnown ransomware use3 publicly disclosedUnsupported product

CVEs closed

1 rated Critical

Exploited

CVE-2021-40449

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.8194

99th percentile

Priority of the 46 CVEs

Patch now 3
                                Urgent 6
                                High 20
                                Routine 17

Applies to

Product
Windows 10 Version 2004 for 32-bit Systems
Windows 10 Version 2004 for ARM64-based Systems
Windows 10 Version 2004 for x64-based Systems
Windows 10 Version 20H2 for 32-bit Systems
Windows 10 Version 20H2 for ARM64-based Systems
Windows 10 Version 20H2 for x64-based Systems
Windows 10 Version 21H1 for 32-bit Systems
Windows 10 Version 21H1 for ARM64-based Systems
Windows 10 Version 21H1 for x64-based Systems
Windows Server, version 2004 (Server Core installation)
Windows Server, version 20H2 (Server Core Installation)

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2021-40449	Windows Win32K	Elevation of Privilege	7.8	0.8194	KEVRansomwareExploited
Patch now	CVE-2021-40450	Windows Win32K	Elevation of Privilege	7.8	0.0152	KEVExploited
Patch now	CVE-2021-41357	Windows Win32K	Elevation of Privilege	7.8	0.0152	KEVExploited
Urgent	CVE-2021-36970	Windows Print Spooler Components	Spoofing	8.8	0.0306	More likely
Urgent	CVE-2021-40461	Role: Windows Hyper-V	Remote Code Execution	8.0	0.0136	Exploitation Less Likely
Urgent	CVE-2021-40443	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0065	More likely
Urgent	CVE-2021-40466	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0065	More likely
Urgent	CVE-2021-40470	Windows DirectX	Elevation of Privilege	7.8	0.0065	More likely
Urgent	CVE-2021-40467	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0054	More likely
High	CVE-2021-40469	Role: DNS Server	Remote Code Execution	7.2	0.0758	DisclosedExploitation Less Likely
High	CVE-2021-36953	Windows TCP/IP	Denial of Service	7.5	0.0505	Exploitation Less Likely
High	CVE-2021-40463	Windows Network Address Translation (NAT)	Denial of Service	7.7	0.0258	Exploitation Less Likely
High	CVE-2021-40462	Microsoft Windows Codecs Library	Remote Code Execution	7.8	0.0252	Exploitation Less Likely
High	CVE-2021-40465	Windows Text Shaping	Remote Code Execution	7.8	0.0247	Exploitation Less Likely
High	CVE-2021-40476	Windows AppContainer	Elevation of Privilege	7.5	0.0240	Exploitation Less Likely
High	CVE-2021-41330	Microsoft Windows Codecs Library	Remote Code Execution	7.8	0.0203	Exploitation Less Likely
High	CVE-2021-41331	Microsoft Windows Codecs Library	Remote Code Execution	7.8	0.0203	Exploitation Less Likely
High	CVE-2021-41340	Microsoft Graphics Component	Remote Code Execution	7.8	0.0203	Exploitation Less Likely
High	CVE-2021-41335	Windows Kernel	Elevation of Privilege	7.8	0.0137	DisclosedExploitation Less Likely
High	CVE-2021-40488	Windows Storage Spaces Controller	Elevation of Privilege	7.8	0.0100	Exploitation Less Likely
High	CVE-2021-26441	Windows Storage Spaces Controller	Elevation of Privilege	7.8	0.0094	Exploitation Less Likely
High	CVE-2021-40478	Windows Storage Spaces Controller	Elevation of Privilege	7.8	0.0084	Exploitation Less Likely
High	CVE-2021-40489	Windows Storage Spaces Controller	Elevation of Privilege	7.8	0.0084	Exploitation Less Likely
High	CVE-2021-41345	Windows Storage Spaces Controller	Elevation of Privilege	7.8	0.0083	Exploitation Less Likely
High	CVE-2021-26442	Windows HTTP.sys	Elevation of Privilege	7.0	0.0079	Exploitation Less Likely

Released the same day

KB4018332
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)
KB4461476
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB4493202
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
KB4618795
Microsoft Dynamics 365 (on-premises) version 9.0, Microsoft Dynamics 365 Customer Engagement V9.0
KB4618810
Microsoft Dynamics 365 (on-premises) version 9.1, Microsoft Dynamics 365 Customer Engagement V9.1
KB5001924
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
KB5001960
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)
KB5001982
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5001985
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)
KB5002004
Microsoft Word 2016 (32-bit edition), Microsoft Word 2016 (64-bit edition)
KB5002006
Microsoft SharePoint Enterprise Server 2016
KB5002027
Microsoft Office Online Server

Vendor advisory

https://support.microsoft.com/help/5006670

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/fix/microsoft/kb5006670">KB5006670 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Which machines still need it?

Patchblox reads the OS build on every Windows machine, from Intune, ConfigMgr or its own agent, and shows which ones are still below the fixed build.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.