Microsoft · Security update · September 14, 2021

KB5005573: September 2021 cumulative update for Windows 10 1607

KB5005573, released September 14, 2021, fixes 30 CVEs across 4 products. 2 of them are being exploited (CVE-2021-40444); 2 on CISA KEV. Patch Radar priority: Patch now.

Patch now2 on CISA KEVKnown ransomware use2 publicly disclosed

CVEs closed

2 rated Critical

Exploited

CVE-2021-40444

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.9784

99th percentile

Priority of the 30 CVEs

Patch now 2
                                Urgent 7
                                High 12
                                Routine 9

Applies to

Product	Build after install
Windows 10 Version 1607 for 32-bit Systems	14393.4651
Windows 10 Version 1607 for x64-based Systems	14393.4651
Windows Server 2016	14393.4651
Windows Server 2016 (Server Core installation)	14393.4651

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2021-40444	Windows MSHTML Platform	Remote Code Execution	8.8	0.9784	KEVRansomwareDisclosedExploited
Patch now	CVE-2021-36955	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0407	KEVRansomwareExploited
Urgent	CVE-2021-36958	Windows Print Spooler Components	Remote Code Execution	7.8	0.3079	DisclosedMore likely
Urgent	CVE-2021-26435	Windows Scripting	Remote Code Execution	8.1	0.0538	Exploitation Less Likely
Urgent	CVE-2021-36965	Windows WLAN Auto Config Service	Remote Code Execution	8.8	0.0468	Exploitation Less Likely
Urgent	CVE-2021-38639	Windows Win32K	Elevation of Privilege	7.8	0.0136	More likely
Urgent	CVE-2021-36963	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0122	More likely
Urgent	CVE-2021-38633	Windows Common Log File System Driver	Elevation of Privilege	7.8	0.0103	More likely
Urgent	CVE-2021-38671	Windows Print Spooler Components	Elevation of Privilege	7.8	0.0055	More likely
High	CVE-2021-1678	Windows NTLM	Spoofing	8.8	0.1003	Exploitation Less Likely
High	CVE-2021-36960	Windows SMB	Information Disclosure	7.5	0.0329	Exploitation Less Likely
High	CVE-2021-36967	Windows WLAN Service	Elevation of Privilege	8.0	0.0092	Exploitation Less Likely
High	CVE-2021-38634	Windows Update	Elevation of Privilege	7.1	0.0087	Exploitation Less Likely
High	CVE-2021-40447	Windows Print Spooler Components	Elevation of Privilege	7.8	0.0071	Exploitation Less Likely
High	CVE-2021-38667	Windows Print Spooler Components	Elevation of Privilege	7.8	0.0055	Exploitation Less Likely
High	CVE-2021-36964	Windows Event Tracing	Elevation of Privilege	7.8	0.0053	Exploitation Less Likely
High	CVE-2021-36973	Windows Redirected Drive Buffering	Elevation of Privilege	7.8	0.0053	Exploitation Less Likely
High	CVE-2021-36974	Windows SMB	Elevation of Privilege	7.8	0.0053	Exploitation Less Likely
High	CVE-2021-38628	Windows Ancillary Function Driver for WinSock	Elevation of Privilege	7.8	0.0053	Exploitation Less Likely
High	CVE-2021-38630	Windows Event Tracing	Elevation of Privilege	7.8	0.0053	Exploitation Less Likely
High	CVE-2021-38638	Windows Ancillary Function Driver for WinSock	Elevation of Privilege	7.8	0.0052	Exploitation Less Likely
Routine	CVE-2021-38629	Windows TDX.sys	Information Disclosure	6.5	0.0269	Exploitation Less Likely
Routine	CVE-2021-36959	Windows Authenticode	Spoofing	5.5	0.0135	Exploitation Less Likely
Routine	CVE-2021-36962	Windows Installer	Information Disclosure	5.5	0.0129	Exploitation Less Likely
Routine	CVE-2021-36961	Windows Installer	Denial of Service	5.5	0.0106	Exploitation Less Likely

Released the same day

KB4484103
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB4484108
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)
KB5001958
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)
KB5001997
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5001999
Microsoft Office Online Server
KB5002003
Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition)
KB5002005
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002007
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)
KB5002009
Microsoft Office Web Apps Server 2013 Service Pack 1
KB5002014
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)
KB5002018
Microsoft SharePoint Server 2019
KB5002020
Microsoft SharePoint Enterprise Server 2016

Vendor advisory

https://support.microsoft.com/help/5005573

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