Microsoft · Security update · December 14, 2021

KB5008215: December 2021 cumulative update for Windows 11 21H2

KB5008215, released December 14, 2021, fixes 31 CVEs across 2 products. One of them is being exploited (CVE-2021-43226); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now1 on CISA KEVKnown ransomware use5 publicly disclosedUnsupported product

CVEs closed

2 rated Critical

Exploited

CVE-2021-43226

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.7097

99th percentile

Priority of the 31 CVEs

Patch now 1
                                Urgent 7
                                High 18
                                Routine 5

Applies to

Product	Build after install
Windows 11 version 21H2 for ARM64-based Systems	22000.376
Windows 11 version 21H2 for x64-based Systems	22000.376

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2021-43226	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0328	KEVRansomwareExploited
Urgent	CVE-2019-0887	Microsoft Windows	Remote Code Execution	8.0	0.7097	More likely
Urgent	CVE-2021-43883	Windows Installer	Elevation of Privilege	7.8	0.1215	DisclosedMore likely
Urgent	CVE-2021-43217	Windows Encrypting File System (EFS)	Remote Code Execution	8.1	0.0652	Exploitation Less Likely
Urgent	CVE-2021-43233	Remote Desktop Client	Remote Code Execution	7.5	0.0236	More likely
Urgent	CVE-2021-41333	Windows Print Spooler Components	Elevation of Privilege	7.8	0.0108	DisclosedMore likely
Urgent	CVE-2021-43207	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0068	More likely
Urgent	CVE-2021-43880	Windows Mobile Device Management	Elevation of Privilege	5.5	0.0067	DisclosedMore likely
High	CVE-2020-0655	Windows Shell	Remote Code Execution	8.0	0.6569	Exploitation Less Likely
High	CVE-2021-43893	Windows Encrypting File System (EFS)	Elevation of Privilege	7.5	0.0672	DisclosedExploitation Less Likely
High	CVE-2021-43228	Windows SymCrypt	Denial of Service	7.5	0.0387	Exploitation Less Likely
High	CVE-2021-43219	Windows DirectX	Denial of Service	7.4	0.0387	Exploitation Less Likely
High	CVE-2021-43222	Windows Message Queuing	Information Disclosure	7.5	0.0317	Exploitation Less Likely
High	CVE-2021-43236	Windows Message Queuing	Information Disclosure	7.5	0.0317	Exploitation Less Likely
High	CVE-2021-43232	Windows Event Tracing	Remote Code Execution	7.8	0.0218	Exploitation Less Likely
High	CVE-2021-43234	Role: Windows Fax Service	Remote Code Execution	7.8	0.0218	Exploitation Less Likely
High	CVE-2021-43229	Windows NTFS	Elevation of Privilege	7.8	0.0179	Exploitation Less Likely
High	CVE-2021-43237	Windows Update Stack	Elevation of Privilege	7.8	0.0107	Exploitation Less Likely
High	CVE-2021-43247	Windows TCP/IP	Elevation of Privilege	7.8	0.0092	Exploitation Less Likely
High	CVE-2021-43238	Windows Remote Access Connection Manager	Elevation of Privilege	7.8	0.0091	Exploitation Less Likely
High	CVE-2021-43231	Windows NTFS	Elevation of Privilege	7.8	0.0072	Exploitation Less Likely
High	CVE-2021-43230	Windows NTFS	Elevation of Privilege	7.8	0.0057	Exploitation Less Likely
High	CVE-2021-43240	Windows NTFS	Elevation of Privilege	7.8	0.0057	DisclosedExploitation Less Likely
High	CVE-2021-43239	Windows Update Stack	Elevation of Privilege	7.1	0.0056	Exploitation Less Likely
High	CVE-2021-43223	Windows Remote Access Connection Manager	Elevation of Privilege	7.8	0.0054	Exploitation Less Likely

Released the same day

KB4486726
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)
KB4504710
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB4504745
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002008
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
KB5002015
Microsoft SharePoint Foundation 2013 Service Pack 1
KB5002033
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002045
Microsoft SharePoint Server Subscription Edition
KB5002047
SharePoint Server Subscription Edition Language Pack
KB5002054
Microsoft SharePoint Server 2019
KB5002055
Microsoft SharePoint Enterprise Server 2016
KB5002059
Microsoft SharePoint Enterprise Server 2016
KB5002061
Microsoft SharePoint Server 2019

Vendor advisory

https://support.microsoft.com/help/5008215

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