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.

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

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

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