Microsoft · Security update · October 12, 2021

KB5006669: October 2021 cumulative update for Windows 10 1607

KB5006669, released October 12, 2021, fixes 34 CVEs across 4 products. One of them is being exploited (CVE-2021-40449); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEVKnown ransomware use4 publicly disclosed

CVEs closed

None rated Critical

Exploited

CVE-2021-40449

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.8194

99th percentile

Priority of the 34 CVEs

Patch now 1
                                Urgent 5
                                High 17
                                Routine 11

Applies to

Product	Build after install
Windows 10 Version 1607 for 32-bit Systems	14393.4704
Windows 10 Version 1607 for x64-based Systems	14393.4704
Windows Server 2016	14393.4704
Windows Server 2016 (Server Core installation)	14393.4704

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
Urgent	CVE-2021-36970	Windows Print Spooler Components	Spoofing	8.8	0.0306	More 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-2021-40465	Windows Text Shaping	Remote Code Execution	7.8	0.0247	Exploitation Less Likely
High	CVE-2021-33781	Windows Active Directory	Security Feature Bypass	8.1	0.0241	DisclosedExploitation Less Likely
High	CVE-2021-40476	Windows AppContainer	Elevation of Privilege	7.5	0.0240	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
Routine	CVE-2021-41338	Windows AppContainer	Security Feature Bypass	5.5	0.0330	DisclosedExploitation Less Likely
Routine	CVE-2021-41332	Windows Print Spooler Components	Information Disclosure	6.5	0.0272	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/5006669

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