Microsoft · Security update · March 9, 2021

KB5000808: March 2021 cumulative update for Windows 10 1909

KB5000808, released March 9, 2021, fixes 49 CVEs across 14 products. 2 of them are being exploited (CVE-2021-26411); 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

4 rated Critical

Exploited

CVE-2021-26411

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.8167

99th percentile

Priority of the 49 CVEs

Patch now 2
                                Urgent 7
                                High 34
                                Routine 6

Applies to

Product	Build after install
Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems	18363.1440
Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems	18363.1440
Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems	18363.1440
Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems	18363.1440
Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems	18363.1440
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for ARM64-based Systems	18363.1440
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for x64-based Systems	18363.1440
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for 32-bit Systems	18363.1440
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for ARM64-based Systems	18363.1440
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for x64-based Systems	18363.1440
Windows 10 Version 1909 for 32-bit Systems	18363.1440
Windows 10 Version 1909 for ARM64-based Systems	18363.1440
Windows 10 Version 1909 for x64-based Systems	18363.1440
Windows Server, version 1909 (Server Core installation)	18363.1440

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2021-26411	Internet Explorer	Remote Code Execution	8.8	0.8167	KEVRansomwareDisclosedExploited
Patch now	CVE-2021-27085	Internet Explorer	Remote Code Execution	8.8	0.0545	KEVExploited
Urgent	CVE-2021-26877	Role: DNS Server	Remote Code Execution	9.8	0.1729	More likely
Urgent	CVE-2021-26863	Microsoft Graphics Component	Elevation of Privilege	7.0	0.1194	More likely
Urgent	CVE-2021-26897	Role: DNS Server	Remote Code Execution	9.8	0.1164	More likely
Urgent	CVE-2021-26868	Microsoft Graphics Component	Elevation of Privilege	7.8	0.0308	More likely
Urgent	CVE-2021-26876	Microsoft Graphics Component	Remote Code Execution	8.8	0.0292	Exploitation Less Likely
Urgent	CVE-2021-26867	Role: Windows Hyper-V	Remote Code Execution	9.9	0.0287	Exploitation Less Likely
Urgent	CVE-2021-24095	Windows DirectX	Elevation of Privilege	7.0	0.0081	More likely
High	CVE-2021-26896	Role: DNS Server	Denial of Service	7.5	0.0785	Exploitation Less Likely
High	CVE-2021-26894	Role: DNS Server	Remote Code Execution	9.8	0.0776	Exploitation Less Likely
High	CVE-2021-26895	Role: DNS Server	Remote Code Execution	9.8	0.0776	Exploitation Less Likely
High	CVE-2021-26893	Role: DNS Server	Remote Code Execution	9.8	0.0702	Exploitation Less Likely
High	CVE-2021-27063	Role: DNS Server	Denial of Service	7.5	0.0673	Exploitation Less Likely
High	CVE-2021-26879	Role: Windows Hyper-V	Denial of Service	7.5	0.0387	Exploitation Less Likely
High	CVE-2021-24090	Windows Error Reporting	Elevation of Privilege	7.8	0.0352	Exploitation Less Likely
High	CVE-2021-26885	Windows WalletService	Elevation of Privilege	7.8	0.0349	Exploitation Less Likely
High	CVE-2021-26861	Microsoft Graphics Component	Remote Code Execution	7.8	0.0289	Exploitation Less Likely
High	CVE-2021-26881	Windows Media	Remote Code Execution	7.5	0.0283	Exploitation Less Likely
High	CVE-2021-26900	Windows Win32K	Elevation of Privilege	7.8	0.0245	Exploitation Less Likely
High	CVE-2021-26882	Windows Remote Access API	Elevation of Privilege	7.8	0.0211	Exploitation Less Likely
High	CVE-2021-27077	Microsoft Graphics Component	Elevation of Privilege	7.8	0.0144	DisclosedExploitation Less Likely
High	CVE-2021-26871	Windows WalletService	Elevation of Privilege	7.8	0.0143	Exploitation Less Likely
High	CVE-2021-26862	Windows Installer	Elevation of Privilege	7.0	0.0125	Exploitation Less Likely
High	CVE-2021-26889	Windows Update Stack	Elevation of Privilege	7.8	0.0117	Exploitation Less Likely

Released the same day

KB3101541
Microsoft Business Productivity Servers 2010 Service Pack 2
KB4484376
Microsoft Visio 2010 Service Pack 2 (32-bit editions), Microsoft Visio 2010 Service Pack 2 (64-bit editions)
KB4486673
Microsoft Visio 2013 Service Pack 1 (32-bit editions), Microsoft Visio 2013 Service Pack 1 (64-bit editions)
KB4493151
Microsoft Visio 2016 (32-bit edition), Microsoft Visio 2016 (64-bit edition)
KB4493177
Microsoft SharePoint Foundation 2013 Service Pack 1
KB4493199
Microsoft SharePoint Enterprise Server 2016
KB4493224
Microsoft PowerPoint 2016 (32-bit edition), Microsoft PowerPoint 2016 (64-bit edition)
KB4493227
Microsoft PowerPoint 2013 RT Service Pack 1, Microsoft PowerPoint 2013 Service Pack 1 (32-bit editions), Microsoft PowerPoint 2013 Service Pack 1 (64-bit editions)
KB4493230
Microsoft SharePoint Server 2019
KB4493231
Microsoft SharePoint Server 2019
KB4493232
Microsoft SharePoint Enterprise Server 2016
KB4493238
Microsoft SharePoint Foundation 2013 Service Pack 1

Vendor advisory

https://support.microsoft.com/help/5000808

For tools and AI agents

This page as data: JSON · Markdown

Which machines still need it?

Patchblox reads the OS build on every Windows machine, from Intune, ConfigMgr or its own agent, and shows which ones are still below the fixed build.

Get a demo

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.