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mskbMicrosoftKB5001943
HistoryJun 08, 2021 - 7:00 a.m.

Description of the security update for Office Online Server: June 8, 2021 (KB5001943)

2021-06-0807:00:00
Microsoft
support.microsoft.com
17

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

Description of the security update for Office Online Server: June 8, 2021 (KB5001943)

Summary

This security update resolves a Microsoft Excel remote code execution vulnerability. To learn more, see Microsoft Common Vulnerabilities and Exposures CVE-2021-31939.

**Note:**To apply this security update, you must have the release version of Microsoft Office Online Server installed on the computer.

Improvements and fixes

This update adds the xmlns attribute to the dependent assemblies in the Web.config file. This change enables Excel Online Web Parts that are created in an earlier version of SharePoint to work in Microsoft SharePoint 2019.

How to get and install the update

Method 1: Microsoft Update

This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Method 3: Microsoft Download Center

You can get the standalone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

More information

Security update deployment information

For deployment information about this update, see Security update deployment information: June 8, 2021 (KB5004128).

Security update replacement information

This security update replaces previously released security update 5001914.

File hash information

File name SHA256 hash
wacserver2019-kb5001943-fullfile-x64-glb.exe 12C2569B45E2ECD76E411F2C025535958BD416CB6C03972EC9DC8B71F5EDB296

File information

Download the list of files that are included in security update 5001943.

Information about protection and security

Protect yourself online: Windows Security supportLearn how we guard against cyber threats: Microsoft Security

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P