March 2021 – Microsoft Patch Tuesday and Other Patches

Update sign and text on a computer keyboard button 3D illustration.

Microsoft has released fixes for 82 vulnerabilities, with 10 updates classified as Critical and 72 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 – 2021-03-14:
DYMO Label Printer fix for BSOD issues.

UPDATE – 2021-03-13:
Microsoft shares temporary fix for Windows 10 printing crashes

UPDATE – 2013-03-13:
Updates on Microsoft Exchange Server Vulnerabilities (CISA)

UPDATE – 2021-03-10:
Windows 10 KB5000802 (March) update is crashing PCs with BSOD
Windows 10 BSOD crashes include the both workstation and server versions running March 2021 cumulative updates:

  • KB5000802: Windows 10 2004/20H2 & Windows Server 2004/20H2
  • KB5000808: Windows 10 1909 & Windows Server 1909
  • KB5000822: Windows 10 1809 & Windows Server 2019
  • KB5000809: Windows 10 1803 & Windows Server 1803

Zero-Day Vulnerabilities Fixes:
1. Internet Explorer Memory Corruption Vulnerability (CVE-2021-26411)
2. Internet Explorer Remote Code Execution Vulnerability (CVE-2021-27085)
3. Windows Win32k Elevation of Privilege Vulnerability (CVE-2021-27077)
4. Microsoft Exchange Server Remote Code Execution Vulnerability (CVE-2021-27078)

Windows 10 Updates for February 2021:

Microsoft Exchange ProxyLogon attacks

Microsoft released out-of-band security updates for the ProxyLogon vulnerability that are actively being used by threat actors worldwide to compromise Microsoft Exchange servers.

These vulnerabilities are being tracked with the following CVEs:

  • CVE-2021-26855 – Microsoft Exchange Server Remote Code Execution Vulnerability
  • CVE-2021-26857 – Microsoft Exchange Server Remote Code Execution Vulnerability
  • CVE-2021-26858 – Microsoft Exchange Server Remote Code Execution Vulnerability
  • CVE-2021-27065 – Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft has released security updates for currently supported Microsoft Exchange cumulative updates and older unsupported versions.

Microsoft has released a PowerShell script called Test-ProxyLogon.ps1 that will check for indicators of compromise (IOC) in Exchange HttpProxy logs, Exchange log files, and Windows Application event logs.

March 2021 Exchange Server Security Updates for older Cumulative Updates of Exchange Server

Additional March 2021 Patching Resources:

On March 9, 2021 (PT), Microsoft released security updates affecting the following Microsoft products:

Product FamilyMaximum SeverityMaximum ImpactAssociated KB Articles and/or Support Webpages
Windows 10 v20H2, v2004, v1909, v1809, and v1803CriticalRemote Code ExecutionWindows 10 v2004 and Windows 10 v20H2: 5000802 Windows 10 v1909: 5000808 Windows 10 v1809: 5000822 Windows 10 v1803: 5000809
Windows Server 2019, Windows Server 2016, and Server Core installations (2019, 2016, v20H2, v2004, and v1909)CriticalRemote Code ExecutionWindows Server 2019: 5000822 Windows Server 2016: 5000803 Windows Server v2004 and Windows Server v20H2: 5000802 Windows Server v1909: 5000808
Windows 8.1, Windows Server 2012 R2, and Windows Server 2012CriticalRemote Code ExecutionWindows 8.1 and Windows Server 2012 R2 Monthly Rollup: 5000848 Windows 8.1 and Windows Server 2012 R2 Security Only: 5000853 Windows Server 2012 Monthly Rollup: 5000847 Windows Server 2012 Security Only: 5000840
Internet Explorer 11CriticalRemote Code ExecutionInternet Explorer 11 Cumulative Update: 5000800
Microsoft Office-related softwareImportantRemote Code Execution4484376, 4486673, 4493151, 4493200, 4493203, 4493214, 4493224, 4493225, 4493227, 4493228, 4493229, 4493233, 4493234, 4493239, 4504702, 4504703, 4504707
Microsoft SharePoint-related softwareImportantRemote Code Execution3101541, 4493177, 4493199, 4493230, 4493231, 4493232, 4493238
Power BI Report ServerImportantInformation Disclosure5001284, 5001285
Azure-related softwareCriticalRemote Code ExecutionFind details on security updates for Azure-related software in the Security Update Guide: https://msrc.microsoft.com/update-guide
Microsoft Visual Studio-related softwareCriticalRemote Code ExecutionFind details on security updates for Visual Studio-related software at https://docs.microsoft.com/visualstudio and in the Security Update Guide: https://msrc.microsoft.com/update-guide
Windows Admin CenterImportantSecurity Feature BypassFind details on security updates for Windows Admin Center in the Security Update Guide: https://msrc.microsoft.com/update-guide
HEVC Video ExtensionsCriticalRemote Code ExecutionFind details on security updates for HEVC Video Extensions in the Security Update Guide: https://msrc.microsoft.com/update-guide

Notes:

  • The summary above is an overview of updates for the most recent versions of commonly used software.
  • Updates for older versions, apps, and open source software may not be listed.
  • Updates may have been added or removed from the release after this content was finalized.
  • 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-Mar  

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 DetailsRCEEOPIDSFBDOSSPFTMPPublicly DisclosedKnown ExploitMax CVSS
Windows 10 v20H2 & Windows Server v20H2112931400109.9
Windows 10 v2004 & Windows Server v2004112931400109.9
Windows 10 v1909 & Windows Server v1909112831400109.9
Windows 10 v1809 & Windows Server 2019102631400109.8
Windows 10 v180342131200108.8
Windows Server 201681731400109.8
Windows 8.1 & Server 2012 R281230400109.8
Windows Server 201281230300109.8
Internet Explorer 112000000118.8
Microsoft Office-related software7001000007.8
Microsoft SharePoint-related software1010010008.8
Power BI Report Server0010000007.7
Azure-related software2010000009.3
Microsoft Visual Studio-related software6000000008.8
Windows Admin Center0001000004.3
HEVC Video Extensions10000000007.8
RCE = Remote Code Execution | EOP = Elevation of Privilege | ID = Information Disclosure | SFB = Security Feature Bypass | DOS = Denial of Service | SPF = Spoofing | TMP = Tampering

Notes: 

  • Vulnerabilities that overlap components may be represented more than once in the table.
  • The summary above is an overview of updates for commonly used software. Updates for older versions, apps, and open source software may not be listed.
  • Updates may have been added or removed from the release after this content was finalized.
  • 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-Mar  

Resources for deploying updates to remote devices

With so many people working remotely, it is a good time to review guidance on deploying security updates to remote devices, such as desktops, laptops, and tablets. Here are some resources to answer questions pertaining to 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. These specific vulnerabilities were selected from the larger set of vulnerabilities in the release for one or more of the following reasons: 1) We received inquiries regarding the vulnerability; 2) the vulnerability may have received attention in the trade press; or 3) the vulnerability is potentially more impactful than others in the release. Because we do not provide summaries for every vulnerability in the release, you should review the content in the Security Update Guide for information not provided in these summaries.

Notes on details in the vulnerability summaries:

Attack VectorThis 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 ComplexityThis 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 RequiredThis metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.
User InteractionThis 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-2021-24089HEVC Video Extensions Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Score MetricsBase CVSS Score: 7.8Privileges Required: NoneConfidentiality: High
Attack Vector: LocalUser Interaction: RequiredIntegrity: High
Attack Complexity: LowScope: UnchangedAvailability: High
Affected Software:HEVC Video Extensions
More Information:https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24089
CVE-2021-24090Windows Error Reporting Elevation of Privilege Vulnerability 
ImpactElevation of Privilege
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Score MetricsBase CVSS Score: 7.8Privileges Required: NoneConfidentiality: High
Attack Vector: LocalUser Interaction: RequiredIntegrity: High
Attack Complexity: LowScope: UnchangedAvailability: High
Affected Software:Windows 10 Version 20H2, Windows 10 Version 2004, Windows 10 Version 1909, Windows Server, version 20H2, Windows Server, version 2004, and Windows Server, version 1909
More Information:https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24090
CVE-2021-26867Windows Hyper-V Remote Code Execution Vulnerability 
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Score MetricsBase CVSS Score: 9.9Privileges Required: LowConfidentiality: High
Attack Vector: NetworkUser Interaction: NoneIntegrity: High
Attack Complexity: LowScope: ChangedAvailability: High
Affected Software:Windows 10 Version 20H2, Windows 10 Version 2004, Windows 10 Version 1909, Windows Server, version 20H2, Windows Server, version 2004, and Windows Server, version 1909
More Information:https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26867
CVE-2021-27077Windows Win32k Elevation of Privilege Vulnerability
ImpactElevation of Privilege
SeverityImportant
Publicly Disclosed?Yes
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Score MetricsBase CVSS Score: 7.8Privileges Required: LowConfidentiality: High
Attack Vector: LocalUser Interaction: NoneIntegrity: High
Attack Complexity: LowScope: UnchangedAvailability: High
Affected Software:All supported versions of Windows
More Information:https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27077
CVE-2021-26897Windows DNS Server Remote Code Execution Vulnerability 
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation more likely
CVSS Score MetricsBase CVSS Score: 9.8Privileges Required: NoneConfidentiality: High
Attack Vector: NetworkUser Interaction: NoneIntegrity: High
Attack Complexity: LowScope: UnchangedAvailability: High
Affected Software:Windows Server, version 20H2, Windows Server, version 2004, Windows Server, version 1909, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, and Windows Server 2012
More Information:https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26897
CVE-2021-26411Internet Explorer Memory Corruption Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?Yes
Known Exploits?Yes
ExploitabilityExploitation detected
CVSS Score MetricsBase CVSS Score: 8.8Privileges Required: NoneConfidentiality: Low
Attack Vector: NetworkUser Interaction: RequiredIntegrity: High
Attack Complexity: LowScope: ChangedAvailability: Low
Affected Software:Internet Explorer 11 on Windows 10 Version 20H2, Windows 10 Version 2004, Windows 10 Version 1909, Windows 10 Version 1809, Windows 10 Version 1803, Windows 8.1, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, and Windows Server 2012 and Microsoft Edge (EdgeHTML-based) on Windows 10 Version 20H2, Windows 10 Version 2004, Windows 10 Version 1909, Windows 10 Version 1809, Windows 10 Version 1803, Windows Server 2019, and Windows Server 2016
More Information:https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26411
CVE-2021-27076Microsoft SharePoint Server Remote Code Execution Vulnerability 
ImpactRemote Code Execution
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation more likely
CVSS Score MetricsBase CVSS Score: 8.8Privileges Required: LowConfidentiality: High
Attack Vector: NetworkUser Interaction: NoneIntegrity: High
Attack Complexity: LowScope: UnchangedAvailability: High
Affected Software:Microsoft SharePoint Foundation 2013, Business Productivity Servers 2010, SharePoint Server 2019, and SharePoint Enterprise Server 2016
More Information:https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27076     
CVE-2021-27053Microsoft Excel Remote Code Execution Vulnerability 
ImpactRemote Code Execution
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Score MetricsBase CVSS Score: 7.8Privileges Required: NoneConfidentiality: High
Attack Vector: LocalUser Interaction: RequiredIntegrity: High
Attack Complexity: LowScope: UnchangedAvailability: High
Affected Software:Microsoft Office 2019, Office Online Server, 365 Apps for Enterprise, Excel 2016, Excel 2013, Excel 2010, and Office Web Apps Server 2013
More Information:https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27053

January 2021 – Microsoft Patch Tuesday and Other Patches

Microsoft has released fixes for 83 vulnerabilities, with ten updates classified as Critical and 73 as Important.

Windows 10 Updates for January 2021:

  • KB4598242 (OS Builds 19041.746 and 19042.746) for Windows 10 version 20H2/2004
  • KB4598229 (OS Build 18363.1316) for Windows 10, version 1909
  • KB4598230 (OS Build 17763.1697) for Windows 10 version 1809
  • KB4598245 (OS Build 17134.1967) for Windows 10 version 1803
  • KB4599208 (OS Build 15063.2614) for Windows 10 version 1703
  • KB4598243 (OS Build 14393.4169) for Windows 10 version 1607
  • KB4598231 (OS Build 10240.18818) for Windows 10, initial release

Additional January 2021 Patching Resources:

On January 12, 2021 (Pacific Time), Microsoft released security updates affecting the following Microsoft products:

Product FamilyMaximum SeverityMaximum ImpactAssociated KB Articles and/or Support Webpages
Windows 10 v20H2, v2004, v1909, v1809, and v1803CriticalRemote Code ExecutionWindows 10 v2004 and Windows 10 v20H2: 4598242 Windows 10 v1909: 4598229 Windows 10 v1809: 4598230 Windows 10 v1803: 4598245
Windows Server 2019, Windows Server 2016, and Server Core installations (2019, 2016, v20H2, v2004, v1909)CriticalRemote Code ExecutionWindows Server 2019: 4598230 Windows Server 2016: 4598243 Windows Server v2004 and Windows Server v20H2: 4598242 Windows Server v1909: 4598229
Windows 8.1, Windows Server 2012 R2, and Windows Server 2012CriticalRemote Code ExecutionWindows 8.1 and Windows Server 2012 R2 Monthly Rollup: 4598285 Windows 8.1 and Windows Server 2012 R2 Security Only: 4598275 Windows Server 2012 Monthly Rollup: 4598278 Windows Server 2012 Security Only: 4598297
Microsoft Office-related softwareImportantRemote Code ExecutionKB Articles associated with Microsoft Office-related software: 4493156, 4486736, 4486755, 4486759, 4486762, 4486764, 4493142, 4493143, 4493145, 4493160, 4493165, 4493168, 4493171, 4493176, 4493181, 4493183, and 4493186
Microsoft SharePoint-related softwareImportantRemote Code ExecutionKB Articles associated with Microsoft SharePoint-related software: 4486683, 4486724, 4493161, 4493162, 4493163, 4493167, 4493175, 4493178, and 4493187
Microsoft .NET-related softwareImportantDenial of ServiceFind details on security updates for .NET Framework-related software in the Security Update Guide: https://msrc.microsoft.com/update-guide
Microsoft SQL Server-related softwareImportantElevation of PrivilegeKB Articles associated with Microsoft SQL Server-related software: 4583456, 4583457, 4583458, 4583459, 4583460, 4583461, 4583462, 4583463, and 4583465
Microsoft Visual Studio-related softwareImportantRemote Code ExecutionKB Articles associated with Microsoft Visual Studio-related software: 4584787
Microsoft Malware Protection EngineCriticalRemote Code ExecutionFind details for security updates for the Microsoft Malware Protection Engine in the Security Update Guide: https://msrc.microsoft.com/update-guide

Notes:

  • The summary above is an overview of updates for the most recent versions of commonly used software.
  • Updates for older versions, apps, and open source software may not be listed.
  • Updates may have been added or removed from the release after this content was finalized.
  • 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-Jan  

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 DetailsRCEEOPIDSFBDOSSPFTMPPublicly DisclosedKnown ExploitMax CVSS
Windows 10 v20H2 & Windows Server v20H21331106200108.8
Windows 10 v2004 & Windows Server v20041331106200108.8
Windows 10 v1909 & Windows Server v1909133086200108.8
Windows 10 v1809 & Windows Server 2019133086100108.8
Windows 10 v1803133076100108.8
Windows Server 2016132775200108.8
Windows 8.1 & Server 2012 R2131764200108.8
Windows Server 2012131752100108.8
Microsoft Office-related software5000000007.8
Microsoft SharePoint-related software4200021008.8
Microsoft SQL Server-related software0100000008.8
Microsoft Visual Studio-related software1200100007.8
Microsoft .NET-related software0000100007.5
Microsoft Malware Protection Engine1000000017.8
RCE = Remote Code Execution | EOP = Elevation of Privilege | ID = Information Disclosure | SFB = Security Feature Bypass | DOS = Denial of Service | SPF = Spoofing | TMP = Tampering

Notes: 

  • Vulnerabilities that overlap components may be represented more than once in the table.
  • The summary above is an overview of updates for commonly used software. Updates for older versions, apps, and open source software may not be listed.
  • Updates may have been added or removed from the release after this content was finalized.
  • 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-Jan  

Resources for deploying updates to remote devices:

With so many people working remotely, it is a good time to review guidance on deploying security updates to remote devices, such as desktops, laptops, and tablets. Here are some resources to answer questions pertaining to 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. These specific vulnerabilities were selected from the larger set of vulnerabilities in the release for one or more of the following reasons: 1) We received inquiries regarding the vulnerability; 2) the vulnerability may have received attention in the trade press; or 3) the vulnerability is potentially more impactful than others in the release. Because we do not provide summaries for every vulnerability in the release, you should review the content in the Security Update Guide for information not provided in these summaries.

Notes on details in the vulnerability summaries:

Attack VectorThis 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 ComplexityThis 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 RequiredThis metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.
User InteractionThis 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-2021-1674Windows Remote Desktop Protocol Core Security Feature Bypass Vulnerability
ImpactSecurity Feature Bypass
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score8.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1674
CVE-2021-1673Remote Procedure Call Runtime Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score8.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1673
CVE-2021-1643HEVC Video Extensions Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareHEVC Video Extensions
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1643
CVE-2021-1648Microsoft splwow64 Elevation of Privilege Vulnerability
ImpactElevation of Privilege
SeverityImportant
Publicly Disclosed?Yes
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1648
CVE-2021-1665GDI+ Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1665
CVE-2021-1705Microsoft Edge (HTML-based) Memory Corruption Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score4.2
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
Affected SoftwareMicrosoft Edge (EdgeHTML-based)
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1705
CVE-2021-1707Microsoft SharePoint Server Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation more likely
CVSS Base Score8.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareMicrosoft SharePoint Foundation 2013, SharePoint Foundation 2010, SharePoint Server 2019, and SharePoint Enterprise Server 2016
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1707
CVE-2021-1714Microsoft Excel Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareMicrosoft Excel 365 Apps for Enterprise, Excel Services, Excel 2010, Excel 2013, Excel 2016, Office 2010, Office 2013, Office 2016, Office 2019, Office 2019 for Mac, Office Online Server, Office Web Apps Server 2013, and Office SharePoint Enterprise Server 2013.
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1714
CVE-2021-1715Microsoft Word Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareMicrosoft Excel 365 Apps for Enterprise, Word 2010, Word 2013, Word 2016, Office 2010, Office 2019, Office 2019 for Mac, Office Online Server, Office Web Apps 2010, Office Web Apps Server 2013, Office SharePoint Enterprise Server 2013, SharePoint Enterprise Server 2016, SharePoint Server 2010, and SharePoint Server 2019 
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1715
CVE-2021-1636Microsoft SQL Elevation of Privilege Vulnerability
ImpactElevation of Privilege
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score8.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareMicrosoft SQL Server 2012, SQL Server 2014, SQL Server 2016, SQL Server 2017, and SQL Server 2019
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1636
CVE-2021-1647Microsoft Defender Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?Yes
ExploitabilityExploitation detected
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareMicrosoft Security Essentials, System Center 2012 R2, System Center Endpoint Protection, Windows Defender
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647 

Disclosure: Source for the info below:

List of patched Office security vulnerabilities

Office security updates published as part of the January 2021 Patch Tuesday 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) attacks.

Microsoft rated the six RCE bugs patched this month as Important severity issues since they could enable attackers to execute arbitrary code in the context of the currently logged-in user.

TagCVE IDCVE TitleSeverity
Microsoft OfficeCVE-2021-1713Microsoft Excel Remote Code Execution VulnerabilityImportant
Microsoft OfficeCVE-2021-1714Microsoft Excel Remote Code Execution VulnerabilityImportant
Microsoft OfficeCVE-2021-1711Microsoft Office Remote Code Execution VulnerabilityImportant
Microsoft OfficeCVE-2021-1715Microsoft Word Remote Code Execution VulnerabilityImportant
Microsoft OfficeCVE-2021-1716Microsoft Word Remote Code Execution VulnerabilityImportant
Microsoft Office SharePointCVE-2021-1712Microsoft SharePoint Elevation of Privilege VulnerabilityImportant
Microsoft Office SharePointCVE-2021-1707Microsoft SharePoint Server Remote Code Execution VulnerabilityImportant
Microsoft Office SharePointCVE-2021-1718Microsoft SharePoint Server Tampering VulnerabilityImportant
Microsoft Office SharePointCVE-2021-1717Microsoft SharePoint Spoofing VulnerabilityImportant
Microsoft Office SharePointCVE-2021-1719Microsoft SharePoint Elevation of Privilege VulnerabilityImportant
Microsoft Office SharePointCVE-2021-1641Microsoft SharePoint Spoofing VulnerabilityImportant

January 2021 Microsoft Office security updates

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

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

To download the January 2021 Microsoft Office security updates, you have to click on the corresponding knowledge base article below and then scroll down to the ‘How to download and install the update‘ section.

Microsoft Office 2016

ProductKnowledge Base article title and number
Excel 2016Security update for Excel 2016 (KB4493165)
Office 2016Security update for Office 2016 (KB4493168)
Office 2016Security update for Office 2016 (KB4486755)
Word 2016Security update for Word 2016 (KB4493156)


Microsoft Office 2013

ProductKnowledge Base article title and number
Excel 2013Security update for Excel 2013 (KB4493176)
Office 2013Security update for Office 2013 (KB4486762)
Office 2013Security update for Office 2013 (KB4486759)
Word 2013Security update for Word 2013 (KB4486764)


Microsoft Office 2010

ProductKnowledge Base article title and number
Excel 2010Security update for Excel 2010 (KB4493186)
Office 2010Security update for Office 2010 (KB4493143)
Office 2010Security update for Office 2010 (KB4493142)
Office 2010Security update for Office 2010 (KB4493181)
Word 2010Security update for Word 2010 (KB4493145)


Microsoft SharePoint Server 2019

ProductKnowledge Base article title and number
Office Online ServerSecurity update for Office Online Server (KB4493160)
SharePoint Server 2019Security update for SharePoint Server 2019 (KB4493162)
SharePoint Server 2019 Language PackSecurity update for SharePoint Server 2019 Language Pack (KB4493161)


Microsoft SharePoint Server 2016

ProductKnowledge Base article title and number
SharePoint Enterprise Server 2016Security update for SharePoint Enterprise Server 2016 (KB4493163)
SharePoint Enterprise Server 2016Security update for SharePoint Enterprise Server 2016 (KB4493167)


Microsoft SharePoint Server 2013

ProductKnowledge Base article title and number
Office Web Apps Server 2013Security update for Office Web Apps Server 2013 (KB4493171)
Project Server 2013Cumulative update for Project Server 2013 (KB4493173)
SharePoint Enterprise Server 2013Security update for SharePoint Enterprise Server 2013 (KB4486724)
SharePoint Enterprise Server 2013Security update for SharePoint Enterprise Server 2013 (KB4486683)
SharePoint Enterprise Server 2013Cumulative update for SharePoint Enterprise Server 2013 (KB4493150)
SharePoint Foundation 2013Security update for SharePoint Foundation 2013 (KB4493175)
SharePoint Foundation 2013Cumulative update for SharePoint Foundation 2013 (KB4493172)


Microsoft SharePoint Server 2010

ProductKnowledge Base article title and number
Project Server 2010Cumulative update for Project Server 2010 (KB4493182)
SharePoint Foundation 2010Security update for SharePoint Foundation 2010 (KB4493187)
SharePoint Server 2010Security update for SharePoint Server 2010 (KB4493178)
SharePoint Server 2010Security update for SharePoint Server 2010 (KB4486736)
SharePoint Server 2010Cumulative update for SharePoint Server 2010 (KB4493184)
SharePoint Server 2010 Office Web AppsSecurity update for SharePoint Server 2010 Office Web Apps (KB4493183)