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HistoryMay 11, 2021 - 7:00 a.m.

Description of the security update for Office 2016: May 11, 2021 (KB5001920)

2021-05-1107:00:00
Microsoft
support.microsoft.com
22

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

8 High

AI Score

Confidence

High

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

0.01 Low

EPSS

Percentile

83.7%

Description of the security update for Office 2016: May 11, 2021 (KB5001920)

Summary

This security update resolves a Microsoft Office remote code execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2021-31176.

**Note:**To apply this security update, you must have the release version of Microsoft Office 2016 installed on the computer.

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn’t apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home (see What version of Office am I using?).

Improvements and fixes

This update contains a fix for the following nonsecurity issue:

  • After you install KB 4504722, some automation add-ins for Excel might not load. This might generate a “Cannot run the macro” error message.

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: May 11, 2021.

Security update replacement information

This security update replaces previously released security update 4504722.

File hash information

File name SHA256 hash
mso2016-kb5001920-fullfile-x86-glb.exe 95CF3F4359B59364BE844FC1153F4067B9FDF58A6DCE93CCB1FD2DC1E808000C
mso2016-kb5001920-fullfile-x64-glb.exe B9E0CA5CA9D151B73E4CE1B9FBDEA19617EA1A5F697657BD6203F5E728823535

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

__

For all supported x86-based versions of Office 2016

File identifier File name File version File size Date Time
firstrun.exe firstrun.exe 16.0.5149.1000 774440 24-Apr-21 06:39
msointl.dll.x86.1025 msointl.dll 16.0.4927.1000 3287904 24-Apr-21 07:20
msointl.dll.x86.1026 msointl.dll 16.0.4927.1000 1886048 24-Apr-21 07:17
msointl.dll.x86.1027 msointl.dll 16.0.4927.1000 1817952 24-Apr-21 07:34
msointl.dll.x86.1029 msointl.dll 16.0.4927.1000 1928032 24-Apr-21 07:20
msointl.dll.x86.1030 msointl.dll 16.0.4927.1000 1758040 24-Apr-21 07:20
msointl.dll.x86.1031 msointl.dll 16.0.4927.1000 1948216 24-Apr-21 07:20
msointl.dll.x86.1032 msointl.dll 16.0.4927.1000 2057048 24-Apr-21 07:20
msointl.dll.x86.3082 msointl.dll 16.0.4927.1000 1826360 24-Apr-21 07:20
msointl.dll.x86.1061 msointl.dll 16.0.4927.1000 1731664 24-Apr-21 07:17
msointl.dll.x86.1069 msointl.dll 16.0.4927.1000 1740640 24-Apr-21 07:34
msointl.dll.x86.1035 msointl.dll 16.0.4927.1000 1738504 24-Apr-21 07:20
msointl.dll.x86.1036 msointl.dll 16.0.4927.1000 1975360 24-Apr-21 07:20
msointl.dll.x86.1110 msointl.dll 16.0.4927.1000 1774648 24-Apr-21 07:34
msointl.dll.x86.1095 msointl.dll 16.0.4927.1000 1830688 24-Apr-21 07:34
msointl.dll.x86.1037 msointl.dll 16.0.4927.1000 2907936 24-Apr-21 07:20
msointl.dll.x86.1081 msointl.dll 16.0.4927.1000 1952312 24-Apr-21 07:20
msointl.dll.x86.1050 msointl.dll 16.0.4927.1000 1742088 24-Apr-21 07:20
msointl.dll.x86.1038 msointl.dll 16.0.4927.1000 1951584 24-Apr-21 07:17
msointl.dll.x86.1057 msointl.dll 16.0.4927.1000 1621848 24-Apr-21 07:17
msointl.dll.x86.1040 msointl.dll 16.0.4927.1000 1766240 24-Apr-21 07:20
msointl.dll.x86.1041 msointl.dll 16.0.4927.1000 2012512 24-Apr-21 07:20
msointl.dll.x86.1087 msointl.dll 16.0.4927.1000 2103648 24-Apr-21 07:20
msointl.dll.x86.1099 msointl.dll 16.0.4927.1000 1940320 24-Apr-21 07:35
msointl.dll.x86.1042 msointl.dll 16.0.4927.1000 2768736 24-Apr-21 07:20
msointl.dll.x86.1063 msointl.dll 16.0.4927.1000 1845808 24-Apr-21 07:20
msointl.dll.x86.1062 msointl.dll 16.0.4927.1000 1832016 24-Apr-21 07:20
msointl.dll.x86.1086 msointl.dll 16.0.4927.1000 1649232 24-Apr-21 07:17
msointl.dll.x86.1044 msointl.dll 16.0.4927.1000 1721624 24-Apr-21 07:20
msointl.dll.x86.1043 msointl.dll 16.0.4927.1000 1771264 24-Apr-21 07:20
msointl.dll.x86.1045 msointl.dll 16.0.4927.1000 1917280 24-Apr-21 07:20
msointl.dll.x86.1046 msointl.dll 16.0.4927.1000 1829656 24-Apr-21 07:20
msointl.dll.x86.2070 msointl.dll 16.0.4927.1000 1836312 24-Apr-21 07:20
msointl.dll.x86.1048 msointl.dll 16.0.4927.1000 1963064 24-Apr-21 07:20
msointl.dll.x86.1049 msointl.dll 16.0.4927.1000 1904384 24-Apr-21 07:20
msointl.dll.x86.1051 msointl.dll 16.0.4927.1000 1971552 24-Apr-21 07:18
msointl.dll.x86.1060 msointl.dll 16.0.4927.1000 1807712 24-Apr-21 07:18
msointl.dll.x86.2074 msointl.dll 16.0.4927.1000 1765936 24-Apr-21 07:20
msointl.dll.x86.9242 msointl.dll 16.0.4927.1000 1794912 24-Apr-21 07:20
msointl.dll.x86.1053 msointl.dll 16.0.4927.1000 1734912 24-Apr-21 07:21
msointl.dll.x86.1054 msointl.dll 16.0.4927.1000 1827376 24-Apr-21 07:21
msointl.dll.x86.1055 msointl.dll 16.0.4927.1000 1998680 24-Apr-21 07:21
msointl.dll.x86.1058 msointl.dll 16.0.4927.1000 1891896 24-Apr-21 07:21
msointl.dll.x86.1066 msointl.dll 16.0.4927.1000 2005552 24-Apr-21 07:18
msointl.dll.x86.2052 msointl.dll 16.0.4927.1000 2321704 24-Apr-21 07:21
msointl.dll.x86.1028 msointl.dll 16.0.4927.1000 2329384 24-Apr-21 07:21
msores.dll msores.dll 16.0.4795.1000 81683304 24-Apr-21 06:39
msores.dll.x86 msores.dll 16.0.4795.1000 81683304 24-Apr-21 06:46
mso.dll.x86 mso.dll 16.0.5161.1002 14419344 25-Apr-21 06:19
msointl.dll.x86.1033 msointl.dll 16.0.4927.1000 1539640 24-Apr-21 06:39

__

For all supported x64-based versions of Office 2016

File identifier File name File version File size Date Time
firstrun.exe firstrun.exe 16.0.5149.1000 816928 24-Apr-21 06:45
msointl.dll.x64.1025 msointl.dll 16.0.5161.1002 3324776 25-Apr-21 06:53
msointl.dll.x64.1026 msointl.dll 16.0.5161.1002 1910120 25-Apr-21 06:27
msointl.dll.x64.1027 msointl.dll 16.0.5161.1002 1842008 25-Apr-21 06:45
msointl.dll.x64.1029 msointl.dll 16.0.5161.1002 1952088 25-Apr-21 06:53
msointl.dll.x64.1030 msointl.dll 16.0.5161.1002 1782104 25-Apr-21 06:53
msointl.dll.x64.1031 msointl.dll 16.0.5161.1002 1972568 25-Apr-21 06:52
msointl.dll.x64.1032 msointl.dll 16.0.5161.1002 2081624 25-Apr-21 06:53
msointl.dll.x64.3082 msointl.dll 16.0.5161.1002 1850712 25-Apr-21 06:52
msointl.dll.x64.1061 msointl.dll 16.0.5161.1002 1755480 25-Apr-21 06:27
msointl.dll.x64.1069 msointl.dll 16.0.5161.1002 1764696 25-Apr-21 06:45
msointl.dll.x64.1035 msointl.dll 16.0.5161.1002 1762672 25-Apr-21 06:53
msointl.dll.x64.1036 msointl.dll 16.0.5161.1002 1999224 25-Apr-21 06:52
msointl.dll.x64.1110 msointl.dll 16.0.5161.1002 1799000 25-Apr-21 06:46
msointl.dll.x64.1095 msointl.dll 16.0.5161.1002 1854808 25-Apr-21 06:46
msointl.dll.x64.1037 msointl.dll 16.0.5161.1002 2944800 25-Apr-21 06:53
msointl.dll.x64.1081 msointl.dll 16.0.5161.1002 1976688 25-Apr-21 06:53
msointl.dll.x64.1050 msointl.dll 16.0.5161.1002 1766232 25-Apr-21 06:53
msointl.dll.x64.1038 msointl.dll 16.0.5161.1002 1975664 25-Apr-21 06:27
msointl.dll.x64.1057 msointl.dll 16.0.5161.1002 1645936 25-Apr-21 06:27
msointl.dll.x64.1040 msointl.dll 16.0.5161.1002 1790824 25-Apr-21 06:52
msointl.dll.x64.1041 msointl.dll 16.0.5161.1002 2036584 25-Apr-21 06:52
msointl.dll.x64.1087 msointl.dll 16.0.5161.1002 2128232 25-Apr-21 06:53
msointl.dll.x64.1099 msointl.dll 16.0.5161.1002 1964392 25-Apr-21 06:46
msointl.dll.x64.1042 msointl.dll 16.0.5161.1002 2793328 25-Apr-21 06:52
msointl.dll.x64.1063 msointl.dll 16.0.5161.1002 1869672 25-Apr-21 06:53
msointl.dll.x64.1062 msointl.dll 16.0.5161.1002 1855832 25-Apr-21 06:53
msointl.dll.x64.1086 msointl.dll 16.0.5161.1002 1673584 25-Apr-21 06:27
msointl.dll.x64.1044 msointl.dll 16.0.5161.1002 1745264 25-Apr-21 06:53
msointl.dll.x64.1043 msointl.dll 16.0.5161.1002 1795432 25-Apr-21 06:53
msointl.dll.x64.1045 msointl.dll 16.0.5161.1002 1941352 25-Apr-21 06:53
msointl.dll.x64.1046 msointl.dll 16.0.5161.1002 1853808 25-Apr-21 06:53
msointl.dll.x64.2070 msointl.dll 16.0.5161.1002 1860456 25-Apr-21 06:53
msointl.dll.x64.1048 msointl.dll 16.0.5161.1002 1986904 25-Apr-21 06:53
msointl.dll.x64.1049 msointl.dll 16.0.5161.1002 1928032 25-Apr-21 06:53
msointl.dll.x64.1051 msointl.dll 16.0.5161.1002 1996128 25-Apr-21 06:27
msointl.dll.x64.1060 msointl.dll 16.0.5161.1002 1832296 25-Apr-21 06:27
msointl.dll.x64.2074 msointl.dll 16.0.5161.1002 1790296 25-Apr-21 06:53
msointl.dll.x64.9242 msointl.dll 16.0.5161.1002 1818968 25-Apr-21 06:53
msointl.dll.x64.1053 msointl.dll 16.0.5161.1002 1759088 25-Apr-21 06:53
msointl.dll.x64.1054 msointl.dll 16.0.5161.1002 1851224 25-Apr-21 06:53
msointl.dll.x64.1055 msointl.dll 16.0.5161.1002 2023256 25-Apr-21 06:53
msointl.dll.x64.1058 msointl.dll 16.0.5161.1002 1915736 25-Apr-21 06:53
msointl.dll.x64.1066 msointl.dll 16.0.5161.1002 2029912 25-Apr-21 06:27
msointl.dll.x64.2052 msointl.dll 16.0.5161.1002 2346272 25-Apr-21 06:52
msointl.dll.x64.1028 msointl.dll 16.0.5161.1002 2353952 25-Apr-21 06:52
msointl.dll.x86.1025 msointl.dll 16.0.4927.1000 3287904 24-Apr-21 07:20
msointl.dll.x86.1026 msointl.dll 16.0.4927.1000 1886048 24-Apr-21 07:17
msointl.dll.x86.1029 msointl.dll 16.0.4927.1000 1928032 24-Apr-21 07:20
msointl.dll.x86.1030 msointl.dll 16.0.4927.1000 1758040 24-Apr-21 07:20
msointl.dll.x86.1031 msointl.dll 16.0.4927.1000 1948216 24-Apr-21 07:20
msointl.dll.x86.1032 msointl.dll 16.0.4927.1000 2057048 24-Apr-21 07:20
msointl.dll.x86.3082 msointl.dll 16.0.4927.1000 1826360 24-Apr-21 07:20
msointl.dll.x86.1061 msointl.dll 16.0.4927.1000 1731664 24-Apr-21 07:17
msointl.dll.x86.1035 msointl.dll 16.0.4927.1000 1738504 24-Apr-21 07:20
msointl.dll.x86.1036 msointl.dll 16.0.4927.1000 1975360 24-Apr-21 07:20
msointl.dll.x86.1037 msointl.dll 16.0.4927.1000 2907936 24-Apr-21 07:20
msointl.dll.x86.1081 msointl.dll 16.0.4927.1000 1952312 24-Apr-21 07:20
msointl.dll.x86.1050 msointl.dll 16.0.4927.1000 1742088 24-Apr-21 07:20
msointl.dll.x86.1038 msointl.dll 16.0.4927.1000 1951584 24-Apr-21 07:17
msointl.dll.x86.1057 msointl.dll 16.0.4927.1000 1621848 24-Apr-21 07:17
msointl.dll.x86.1040 msointl.dll 16.0.4927.1000 1766240 24-Apr-21 07:20
msointl.dll.x86.1041 msointl.dll 16.0.4927.1000 2012512 24-Apr-21 07:20
msointl.dll.x86.1087 msointl.dll 16.0.4927.1000 2103648 24-Apr-21 07:20
msointl.dll.x86.1042 msointl.dll 16.0.4927.1000 2768736 24-Apr-21 07:20
msointl.dll.x86.1063 msointl.dll 16.0.4927.1000 1845808 24-Apr-21 07:20
msointl.dll.x86.1062 msointl.dll 16.0.4927.1000 1832016 24-Apr-21 07:20
msointl.dll.x86.1086 msointl.dll 16.0.4927.1000 1649232 24-Apr-21 07:17
msointl.dll.x86.1044 msointl.dll 16.0.4927.1000 1721624 24-Apr-21 07:20
msointl.dll.x86.1043 msointl.dll 16.0.4927.1000 1771264 24-Apr-21 07:20
msointl.dll.x86.1045 msointl.dll 16.0.4927.1000 1917280 24-Apr-21 07:20
msointl.dll.x86.1046 msointl.dll 16.0.4927.1000 1829656 24-Apr-21 07:20
msointl.dll.x86.2070 msointl.dll 16.0.4927.1000 1836312 24-Apr-21 07:20
msointl.dll.x86.1048 msointl.dll 16.0.4927.1000 1963064 24-Apr-21 07:20
msointl.dll.x86.1049 msointl.dll 16.0.4927.1000 1904384 24-Apr-21 07:20
msointl.dll.x86.1051 msointl.dll 16.0.4927.1000 1971552 24-Apr-21 07:18
msointl.dll.x86.1060 msointl.dll 16.0.4927.1000 1807712 24-Apr-21 07:18
msointl.dll.x86.2074 msointl.dll 16.0.4927.1000 1765936 24-Apr-21 07:20
msointl.dll.x86.9242 msointl.dll 16.0.4927.1000 1794912 24-Apr-21 07:20
msointl.dll.x86.1053 msointl.dll 16.0.4927.1000 1734912 24-Apr-21 07:21
msointl.dll.x86.1054 msointl.dll 16.0.4927.1000 1827376 24-Apr-21 07:21
msointl.dll.x86.1055 msointl.dll 16.0.4927.1000 1998680 24-Apr-21 07:21
msointl.dll.x86.1058 msointl.dll 16.0.4927.1000 1891896 24-Apr-21 07:21
msointl.dll.x86.1066 msointl.dll 16.0.4927.1000 2005552 24-Apr-21 07:18
msointl.dll.x86.2052 msointl.dll 16.0.4927.1000 2321704 24-Apr-21 07:21
msointl.dll.x86.1028 msointl.dll 16.0.4927.1000 2329384 24-Apr-21 07:21
conversion.office.msores.dll msores.dll 16.0.4795.1000 81683088 24-Apr-21 06:40
msores.dll msores.dll 16.0.4795.1000 81683088 24-Apr-21 06:39
ppt.conversion.msores.dll msores.dll 16.0.4795.1000 81683088
ppt.edit.msores.dll msores.dll 16.0.4795.1000 81683088
wac.office.msores.dll msores.dll 16.0.4795.1000 81683088
msores.dll msores.dll 16.0.4795.1000 81683304 24-Apr-21 06:39
msores.dll.x86 msores.dll 16.0.4795.1000 81683304 24-Apr-21 06:46
mso.dll.x64 mso.dll 16.0.5161.1002 19875728 25-Apr-21 06:21
mso.dll.x86 mso.dll 16.0.5161.1002 14419344 25-Apr-21 06:19
msointl.dll.x64.1033 msointl.dll 16.0.4927.1000 1564424 24-Apr-21 06:40
msointl.dll.x86.1033 msointl.dll 16.0.4927.1000 1539640 24-Apr-21 06:39

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

8 High

AI Score

Confidence

High

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

0.01 Low

EPSS

Percentile

83.7%