Microsoft has released fixes for 56 vulnerabilities, with 11 updates classified as Critical and 43 as Important. Here’s an updated announcement (2021-02-09) from Microsoft: Deploy Windows SSUs and LCUs together with one cumulative update –

Beginning with the February 2021 LCU, we will now publish all future cumulative updates and SSUs for Windows 10, version 2004 and above together as one cumulative monthly update to the normal release category in WSUS.

LCU = Latest Cummulative Update
SSU – Servicing Stack Update

UPDATE – 2021-02-21
KB4301818 > KB5001078

UPDATE – 2021-02-17
KB4577586

Windows 10 Updates for February 2021:

• KB4601319 (OS Builds 19041.804 and 19042.804) for Windows 10 version 20H2 / 2004
• KB4601315 (OS Build 18363.1377) for Windows 10, version 1909
• KB5001028 (OS Build 18363.1379) Out-of-band for Windows 10, version 1909
• KB4601345 (OS Build 17763.1757) for Windows 10 version 1809
• KB4601354 (OS Build 17134.2026) for Windows 10 version 1803
• KB4601330 (OS Build 15063.2642) for Windows 10 version 1703
• KB4601318 (OS Build 14393.4225) for Windows 10 version 1607
• KB4601331 (OS Build 10240.18842) for Windows 10, initial release

Additional February 2021 Patching Resources:

• MSRC – February 2021 Security Updates
• Security Update Guide – Microsoft Security Vulnerabilities
• Internet Explorer 11 zero-day vulnerability gets unofficial micro-patch
• Windows 10 v1909 receives KB5001028 out-of-band fix for WPA3 Wi-Fi
• Advisory ADV990001 for the latest service stack update (SSU)
• Intel fixes vulnerabilities in Windows, Linux graphics drivers
• Adobe Security patches
• Cisco Security patches
• Apple Security patches
• Android Security Bulletin
• Oracle Security Alerts
• Scan Changes and certificates add security for Windows devices using WSUS for updates
• Netlogon Domain Controller Enforcement Mode enabled by default on February 9, 2021
• Zero Day Initiative blog
• SAP February 2021 Security Updates
• Google fixes severe Golang Windows RCE vulnerability
• Apple fixes SUDO root privilege escalation flaw in macOS

Patched publicly disclosed vulnerabilities:

• CVE-2021-1721 – .NET Core and Visual Studio Denial of Service Vulnerability
• CVE-2021-1727 – Windows Installer Elevation of Privilege Vulnerability
• CVE-2021-1733 – Sysinternals PsExec Elevation of Privilege Vulnerability
• CVE-2021-24098 – Windows Console Driver Denial of Service Vulnerability
• CVE-2021-24106 – Windows DirectX Information Disclosure Vulnerability
• CVE-2021-26701 – .NET Core Remote Code Execution Vulnerability

Intel microcode updates for Windows:

Microsoft has also released Intel microcode updates for Windows 10 20H2, 2004, 1909, and older versions to fix issues impacting current and previously released Windows 10 versions.

These microcode updates are offered to affected devices via Windows Update but they can also be manually downloaded directly from the Microsoft Catalog using these links:

• KB4589212: Intel microcode updates for Windows 10, version 2004 and 20H2, and Windows Server, version 2004 and 20H2
• KB4589211: Intel microcode updates for Windows 10, version 1903 and 1909, and Windows Server, version 1903 and 1909
• KB4589208: Intel microcode updates for Windows 10, version 1809 and Windows Server 2019
• KB4589206: Intel microcode updates for Windows 10, version 1803
• KB4589210: Intel microcode updates for Windows 10, version 1607 and Windows Server 2016
• KB4589198: Intel microcode updates for Windows 10, version 1507

On February 9, 2021, Microsoft released security updates affecting the following Microsoft products:

Product Family	Maximum Severity	Maximum Impact	Associated KB Articles and/or Support Webpages
Windows 10 v20H2, v2004, v1909, v1809, and v1803	Critical	Remote Code Execution	Windows 10 v2004 and Windows 10 v20H2: 4601319 Windows 10 v1909: 4601315 Windows 10 v1809: 4601345 Windows 10 v1803: 4601354
Windows Server 2019, Windows Server 2016, and Server Core installations (2019, 2016, v20H2, v2004, and v1909)	Critical	Remote Code Execution	Windows Server 2019: 4601345 Windows Server 2016: 4601318 Windows Server v2004 and Windows Server v20H2: 4601319 Windows Server v1909: 4601315
Windows 8.1, Windows Server 2012 R2, and Windows Server 2012	Critical	Remote Code Execution	Windows 8.1 and Windows Server 2012 R2 Monthly Rollup: 4601384 Windows 8.1 and Windows Server 2012 R2 Security Only: 4601349 Windows Server 2012 Monthly Rollup: 4601348 Windows Server 2012 Security Only: 4601357
Microsoft Office-related software	Important	Remote Code Execution	4493211, 4493222, 4493196, 4493192, 4493204
Microsoft SharePoint-related software	Important	Remote Code Execution	4493210, 4493194, 4493195, 4493223
Microsoft Lync/Skype for Business	Important	Denial of Service	5000675, 5000688
Microsoft Exchange Server	Important	Spoofing	4602269, 4571787
Microsoft .NET-related software	Critical	Remote Code Execution	4601318, 4601050, 4601887, 4603004, 4602960, 4603005, 4602961, 4601354, 4601056, 4603003, 4602959, 4603002, 4602958, 4601051, 4601054
Microsoft Visual Studio	Important	Remote Code Execution	Find details on security updates for Visual Studio-related software in the Security Update Guide: https://msrc.microsoft.com/update-guide
Microsoft Dynamics-related software	Important	Information Disclosure	4602915
Microsoft Azure-related software	Important	Elevation of Privilege	Find details on security updates for Azure-related software in the Security Update Guide: https://msrc.microsoft.com/update-guide
Developer tools	Important	Remote Code Execution	Find details on security updates for developer tools in the Security Update Guide: https://msrc.microsoft.com/update-guide

Notes:

• Find details for all updates in the monthly release in the Security Update Guide: https://msrc.microsoft.com/update-guide
• For additional details, see the release notes at: https://msrc.microsoft.com/update-guide/releaseNote/2021-Feb  

Security vulnerability overview:

Below is a summary showing the number of vulnerabilities addressed in this release, broken down by product/component and by impact.

Vulnerability Details	RCE	EOP	ID	SFB	DOS	SPF	TMP	Publicly Disclosed	Known Exploit	Max CVSS
Windows 10 v20H2 & Windows Server v20H2	10	7	5	2	4	0	0	3	1	9.8
Windows 10 v2004 & Windows Server v2004	10	7	5	2	4	0	0	3	1	9.8
Windows 10 v1909 & Windows Server v1909	10	6	5	2	3	0	0	3	1	9.8
Windows 10 v1809 & Windows Server 2019	10	7	5	2	3	0	0	3	1	9.8
Windows 10 v1803	7	6	4	2	3	0	0	3	1	9.8
Windows Server 2016	10	5	3	1	2	0	0	1	0	9.8
Windows 8.1 & Server 2012 R2	7	4	3	0	2	0	0	1	0	9.8
Windows Server 2012	7	4	3	0	2	0	0	1	0	9.8
Microsoft Office-related software	4	0	0	0	0	0	0	0	0	7.8
Microsoft SharePoint-related software	2	0	1	0	0	1	0	0	0	8.8
Lync/Skype for Business	0	0	0	0	1	1	0	0	0	6.5
Microsoft Exchange Server	0	0	0	0	0	2	0	0	0	6.5
Microsoft .NET-related software	2	0	0	0	2	0	0	0	0	8.1
Microsoft Visual Studio-related software	2	0	0	0	1	0	0	1	0	7.8
Microsoft Dynamics-related software	0	0	1	0	0	1	0	0	0	6.5
Microsoft Azure-related software	0	2	0	0	0	0	0	0	0	7.0
Developer tools	1	1	0	0	0	0	0	0	0	7.8
RCE = Remote Code Execution | EOP = Elevation of Privilege | ID = Information Disclosure | SFB = Security Feature Bypass | DOS = Denial of Service | SPF = Spoofing | TMP = Tampering

Resources for deploying updates to remote devices:

Part 1: Helping businesses rapidly set up to work securely from personal PCs and mobiles
Part 2: Helping IT send and provision business PCs at home to work securely during COVID-19
Part 3: Manage work devices at home during Covid-19 using Configuration Manager
Part 4: Managing remote machines with cloud management gateway (CMG)
Part 5: Managing Patch Tuesday with Configuration Manager in a remote work world

See also:
Mastering​ Configuration Manager Bandwidth limitations for VPN connected Clients

Vulnerability details for the current month:

Below are summaries for some of the security vulnerabilities in this release:

Attack Vector	This metric reflects the context by which vulnerability exploitation is possible. The Base Score increases the more remote (logically, and physically) an attacker can be in order to exploit the vulnerable component.
Attack Complexity	This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability. Such conditions may require the collection of more information about the target or computational exceptions. The assessment of this metric excludes any requirements for user interaction in order to exploit the vulnerability. If a specific configuration is required for an attack to succeed, the Base metrics should be scored assuming the vulnerable component is in that configuration.
Privileges Required	This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.
User Interaction	This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise the vulnerable component. This metric determines whether the vulnerability can be exploited solely at the will of the attacker, or whether a separate user (or user-initiated process) must participate in some manner.

CVE-2021-1727	Windows Installer Elevation of Privilege Vulnerability
Impact	Elevation of Privilege
Severity	Important
Publicly Disclosed?	Yes
Known Exploits?	No
Exploitability	Exploitation more likely
CVSS Base Score	7.8
Attack Vector	Local
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	All supported versions of Windows
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1727

CVE-2021-1732	Windows Win32k Elevation of Privilege Vulnerability
Impact	Elevation of Privilege
Severity	Important
Publicly Disclosed?	No
Known Exploits?	Yes
Exploitability	Exploitation detected
CVSS Base Score	7.8
Attack Vector	Local
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	Windows 10 v20H2, Windows 10 v2004, Windows 10 v1909, Windows 10 v1809, Windows 10 v1803, Windows Server v20H2, Windows Server v2004, Windows Server v1909, and Windows Server 2019
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1732

CVE-2021-24074	Windows TCP/IP Remote Code Execution Vulnerability
Impact	Remote Code Execution
Severity	Critical
Publicly Disclosed?	No
Known Exploits?	No
Exploitability	Exploitation more likely
CVSS Base Score	9.8
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	All supported versions of Windows
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24074

CVE-2021-24094	Windows TCP/IP Remote Code Execution Vulnerability
Impact	Remote Code Execution
Severity	Critical
Publicly Disclosed?	No
Known Exploits?	No
Exploitability	Exploitation more likely
CVSS Base Score	9.8
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	All supported versions of Windows
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24094

CVE-2021- 24077	Windows Fax Service Remote Code Execution Vulnerability
Impact	Remote Code Execution
Severity	Critical
Publicly Disclosed?	No
Known Exploits?	No
Exploitability	Exploitation less likely
CVSS Base Score	9.8
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	All supported versions of Windows
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24077

CVE-2021-24078	Windows DNS Server Remote Code Execution Vulnerability
Impact	Remote Code Execution
Severity	Critical
Publicly Disclosed?	No
Known Exploits?	No
Exploitability	Exploitation more likely
CVSS Base Score	9.8
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	Windows Server v20H2, Windows Server v2004, Windows Server v1909, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, and Windows Server 2012
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24078

CVE-2021-24088	Windows Local Spooler Remote Code Execution Vulnerability
Impact	Remote Code Execution
Severity	Critical
Publicly Disclosed?	No
Known Exploits?	No
Exploitability	Exploitation less likely
CVSS Base Score	8.8
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	All supported versions of Windows
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24088

CVE-2021-24098	Windows Console Driver Denial of Service Vulnerability
Impact	Denial of Service
Severity	Important
Publicly Disclosed?	Yes
Known Exploits?	No
Exploitability	Exploitation less likely
CVSS Base Score	5.5
Attack Vector	Local
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High
Affected Software	Windows 10 v20H2, Windows 10 v2004, Windows 10 v1909, Windows 10 v1809, Windows 10 v1803, Windows Server v20H2, Windows Server v2004, Windows Server v1909, and Windows Server 2019
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24098

CVE-2021-24066	Microsoft SharePoint Remote Code Execution Vulnerability
Impact	Remote Code Execution
Severity	Important
Publicly Disclosed?	No
Known Exploits?	No
Exploitability	Exploitation more likely
CVSS Base Score	8.8
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	Microsoft SharePoint Server 2019, Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Foundation 2013 Service Pack 1, and Microsoft SharePoint Foundation 2010 Service Pack 2
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24066

CVE-2021-24067	Microsoft Excel Remote Code Execution Vulnerability
Impact	Remote Code Execution
Severity	Important
Publicly Disclosed?	No
Known Exploits?	No
Exploitability	Exploitation less likely
CVSS Base Score	7.8
Attack Vector	Local
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High
Affected Software	Microsoft 365 Apps for Enterprise, Excel 2016, Excel 2013, Excel 2010, Office Online Server, Office 2019, Office 2019 for Mac, and Office Web Apps Server 2013
More Information	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24067

February 2021 Microsoft Office security updates

Microsoft Office security updates are delivered through the Microsoft Update platform and via the Download Center.

Patched Office security vulnerabilities – (Source: Bleeping Computer)

This month’s Office security updates address bugs exposing Windows systems running vulnerable Click to Run and Microsoft Installer (.msi) based editions of Microsoft Office products to remote code execution (RCE), information disclosure, and spoofing attacks.

Microsoft rated the six RCE bugs patched in February 2021 as Important severity issues given that they could enable attackers to execute arbitrary code in the context of the currently logged-in user.

Following successful exploitation, attackers could install malicious programs, view, change, and delete data, as well as make their own admin accounts on exploited Windows devices.

Tag	CVE ID	CVE Title	Severity
Microsoft Office Excel	CVE-2021-24067	Microsoft Excel Remote Code Execution Vulnerability	Important
Microsoft Office Excel	CVE-2021-24068	Microsoft Excel Remote Code Execution Vulnerability	Important
Microsoft Office Excel	CVE-2021-24069	Microsoft Excel Remote Code Execution Vulnerability	Important
Microsoft Office Excel	CVE-2021-24070	Microsoft Excel Remote Code Execution Vulnerability	Important
Microsoft Office SharePoint	CVE-2021-24071	Microsoft SharePoint Information Disclosure Vulnerability	Important
Microsoft Office SharePoint	CVE-2021-1726	Microsoft SharePoint Spoofing Vulnerability	Important
Microsoft Office SharePoint	CVE-2021-24066	Microsoft SharePoint Remote Code Execution Vulnerability	Important
Microsoft Office SharePoint	CVE-2021-24072	Microsoft SharePoint Server Remote Code Execution Vulnerability	Important

Further information about each of them is available within the knowledge base articles linked below.

Microsoft Office 2016:

Product	Knowledge Base article title and number
Excel 2016	Description of the security update for Excel 2016: February 9, 2021 (KB4493196)
Office 2016	February 2, 2021, update for Office 2016 (KB4493189)
Outlook 2016	February 2, 2021, update for Outlook 2016 (KB4493190)
PowerPoint 2016	February 2, 2021, update for PowerPoint 2016 (KB4493164)

Microsoft Office 2013:

Product	Knowledge Base article title and number
Excel 2013	Description of the security update for Excel 2013: February 9, 2021 (KB4493211)
Office 2013	February 2, 2021, update for Office 2013 (KB4486684)
PowerPoint 2013	February 2, 2021, update for PowerPoint 2013 (KB4493169)

Microsoft Office 2010:

Product	Knowledge Base article title and number
Excel 2010	Description of the security update for Excel 2010: February 9, 2021 (KB4493222)
Office 2010	February 2, 2021, update for Office 2010 (KB4493180)
PowerPoint 2010	February 2, 2021, update for PowerPoint 2010 (KB4493179)

Microsoft SharePoint Server 2019:

Product	Knowledge Base article title and number
Office Online Server	Description of the security update for Office Online Server: February 9, 2021 (KB4493192)
SharePoint Server 2019	Description of the security update for SharePoint Server 2019: February 9, 2021 (KB4493194)
SharePoint Server 2019 Language Pack	February 9, 2021, update for SharePoint Server 2019 Language Pack (KB4493193)

Microsoft SharePoint Server 2016:

Product	Knowledge Base article title and number
SharePoint Enterprise Server 2016	Description of the security update for SharePoint Enterprise Server 2016: February 9, 2021 (KB4493195)

Microsoft SharePoint Server 2013:

Product	Knowledge Base article title and number
Office Web Apps Server 2013	Description of the security update for Office Web Apps Server 2013: February 9, 2021 (KB4493204)
Project Server 2013	February 9, 2021, cumulative update for Project Server 2013 (KB4493207)
SharePoint Enterprise Server 2013	February 9, 2021, cumulative update for SharePoint Enterprise Server 2013 (KB4493209)
SharePoint Foundation 2013	Description of the security update for SharePoint Foundation 2013: February 9, 2021 (KB4493210)
SharePoint Foundation 2013	February 9, 2021, cumulative update for SharePoint Foundation 2013 (KB4493205)

Microsoft SharePoint Server 2010:

Product	Knowledge Base article title and number
Project Server 2010	February 9, 2021, update for Project Server 2010 (KB4475537)
Project Server 2010	February 9, 2021, cumulative update for Project Server 2010 (KB4493217)
SharePoint Foundation 2010	Description of the security update for SharePoint Foundation 2010: February 9, 2021 (KB4493223)
SharePoint Server 2010	February 9, 2021, cumulative update for SharePoint Server 2010 (KB4493220)
SharePoint Server 2010	February 9, 2021, update for SharePoint Server 2010 (KB4493212)
SharePoint Server 2010 Office Web Apps	February 9, 2021, update for SharePoint Server 2010 Office Web Apps (KB4493219)