Microsoft · Security update · September 14, 2021

KB5005575: September 2021 cumulative update for Windows Server 2022

KB5005575, released September 14, 2021, fixes 30 CVEs across 2 products. 3 of them are being exploited (CVE-2021-34527); 3 on CISA KEV. Patch Radar priority: Patch now.

Patch now3 on CISA KEVKnown ransomware use2 publicly disclosed

CVEs closed

3 rated Critical

Exploited

CVE-2021-34527

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.9979

99th percentile

Priority of the 30 CVEs

Patch now 3
                                Urgent 7
                                High 11
                                Routine 9

Applies to

Product	Build after install
Windows Server 2022	20348.230
Windows Server 2022 (Server Core installation)	20348.230

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2021-34527	Windows Print Spooler Components	Remote Code Execution	8.8	0.9979	KEVRansomwareDisclosedExploited
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-2021-26435	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-2021-36975	Windows Win32K	Elevation of Privilege	7.8	0.0133	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-2021-36960	Windows SMB	Information Disclosure	7.5	0.0329	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-2021-36954	Windows Bind Filter Driver	Elevation of Privilege	8.8	0.0053	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-2021-36961	Windows Installer	Denial of Service	5.5	0.0106	Exploitation Less Likely
Routine	CVE-2021-36969	Windows Redirected Drive Buffering	Information Disclosure	5.5	0.0088	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/5005575

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