Microsoft · Security update · October 12, 2021

KB5006667: October 2021 cumulative update for Windows 10 1909

KB5006667, released October 12, 2021, fixes 38 CVEs across 3 products. 2 of them are being exploited (CVE-2021-40449); 2 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now2 on CISA KEVKnown ransomware use2 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 38 CVEs

Patch now 2
                                Urgent 6
                                High 18
                                Routine 12

Applies to

Product	Build after install
Windows 10 Version 1909 for 32-bit Systems	18363.1854
Windows 10 Version 1909 for ARM64-based Systems	18363.1854
Windows 10 Version 1909 for x64-based Systems	18363.1854

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
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-2021-36953	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
High	CVE-2021-41347	Windows AppX Deployment Service	Elevation of Privilege	7.8	0.0071	Exploitation Less Likely
High	CVE-2021-40477	Windows Event Tracing	Elevation of Privilege	7.8	0.0058	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/5006667

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