Summary

This security update resolves a Microsoft Office spoofing vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2021-38650.

Note To apply this security update, you must have the release version of 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?)

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: September 14, 2021 (KB5005848).

Security update replacement information

This security update replaces previously released security update 4464534.

File hash information

File name

SHA256 hash

osfclient2016-kb4484103-fullfile-x86-glb.exe

E76412E0F148C5D52E609A373AEEB85778D446A44DD01590CC2333FC33BE24F9

osfclient2016-kb4484103-fullfile-x64-glb.exe

76C59F9FBDB41D427DB88A9D8A9542BA46835FA04000D621CBA4DD93930386A8

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

osfintl.dll_1025

osfintl.dll

16.0.5215.1000

260944

18-Aug-21

03:28

osfintl.dll_1026

osfintl.dll

16.0.5215.1000

262992

18-Aug-21

02:56

osfintl.dll_1029

osfintl.dll

16.0.5215.1000

259456

18-Aug-21

03:28

osfintl.dll_1030

osfintl.dll

16.0.5215.1000

257928

18-Aug-21

03:28

osfintl.dll_1031

osfintl.dll

16.0.5215.1000

259504

18-Aug-21

03:28

osfintl.dll_1032

osfintl.dll

16.0.5215.1000

266576

18-Aug-21

03:28

osfintl.dll_3082

osfintl.dll

16.0.5215.1000

256920

18-Aug-21

03:28

osfintl.dll_1061

osfintl.dll

16.0.5215.1000

255888

18-Aug-21

02:56

osfintl.dll_1035

osfintl.dll

16.0.5215.1000

255344

18-Aug-21

03:28

osfintl.dll_1036

osfintl.dll

16.0.5215.1000

260488

18-Aug-21

03:28

osfintl.dll_1037

osfintl.dll

16.0.5215.1000

255824

18-Aug-21

03:28

osfintl.dll_1081

osfintl.dll

16.0.5215.1000

269648

18-Aug-21

03:28

osfintl.dll_1050

osfintl.dll

16.0.5215.1000

256432

18-Aug-21

03:28

osfintl.dll_1038

osfintl.dll

16.0.5215.1000

261000

18-Aug-21

02:56

osfintl.dll_1057

osfintl.dll

16.0.5215.1000

254856

18-Aug-21

02:56

osfintl.dll_1040

osfintl.dll

16.0.5215.1000

258456

18-Aug-21

03:28

osfintl.dll_1041

osfintl.dll

16.0.5215.1000

259920

18-Aug-21

03:28

osfintl.dll_1087

osfintl.dll

16.0.5215.1000

265040

18-Aug-21

03:28

osfintl.dll_1042

osfintl.dll

16.0.5215.1000

258384

18-Aug-21

03:28

osfintl.dll_1063

osfintl.dll

16.0.5215.1000

258456

18-Aug-21

03:28

osfintl.dll_1062

osfintl.dll

16.0.5215.1000

259472

18-Aug-21

03:28

osfintl.dll_1086

osfintl.dll

16.0.5215.1000

255880

18-Aug-21

02:56

osfintl.dll_1044

osfintl.dll

16.0.5215.1000

254856

18-Aug-21

03:28

osfintl.dll_1043

osfintl.dll

16.0.5215.1000

257928

18-Aug-21

03:28

osfintl.dll_1045

osfintl.dll

16.0.5215.1000

258960

18-Aug-21

03:28

osfintl.dll_1046

osfintl.dll

16.0.5215.1000

256928

18-Aug-21

03:28

osfintl.dll_2070

osfintl.dll

16.0.5215.1000

256928

18-Aug-21

03:28

osfintl.dll_1048

osfintl.dll

16.0.5215.1000

262512

18-Aug-21

03:28

osfintl.dll_1049

osfintl.dll

16.0.5215.1000

264016

18-Aug-21

03:28

osfintl.dll_1051

osfintl.dll

16.0.5215.1000

259984

18-Aug-21

02:56

osfintl.dll_1060

osfintl.dll

16.0.5215.1000

256952

18-Aug-21

02:56

osfintl.dll_2074

osfintl.dll

16.0.5215.1000

256432

18-Aug-21

03:28

osfintl.dll_9242

osfintl.dll

16.0.5215.1000

258480

18-Aug-21

03:28

osfintl.dll_1053

osfintl.dll

16.0.5215.1000

255872

18-Aug-21

03:28

osfintl.dll_1054

osfintl.dll

16.0.5215.1000

265040

18-Aug-21

03:28

osfintl.dll_1055

osfintl.dll

16.0.5215.1000

258952

18-Aug-21

03:28

osfintl.dll_1058

osfintl.dll

16.0.5215.1000

264016

18-Aug-21

03:28

osfintl.dll_1066

osfintl.dll

16.0.5215.1000

260432

18-Aug-21

02:56

osfintl.dll_2052

osfintl.dll

16.0.5215.1000

253776

18-Aug-21

03:28

osfintl.dll_1028

osfintl.dll

16.0.5215.1000

253776

18-Aug-21

03:28

osfintl.dll_1033

osfintl.dll

16.0.5215.1000

253840

18-Aug-21

03:28

minsbproxy.dll

minsbproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:51

minsbproxy.dll.x86

minsbproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:58

minsbroamingproxy.dll

minsbroamingproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:51

minsbroamingproxy.dll.x86

minsbroamingproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:58

msosb.dll

msosb.dll

16.0.5215.1000

155504

18-Aug-21

02:51

msosb.dll.x86

msosb.dll

16.0.5215.1000

155504

18-Aug-21

02:58

osf.dll

osf.dll

16.0.5215.1000

1183120

18-Aug-21

02:51

osfproxy.dll

osfproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:51

osfproxy.dll.x86

osfproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:58

osfroamingproxy.dll

osfroamingproxy.dll

16.0.5215.1000

44432

18-Aug-21

02:51

osfroamingproxy.dll.x86

osfroamingproxy.dll

16.0.5215.1000

44432

18-Aug-21

02:58

osfshared.dll

osfshared.dll

16.0.5200.1000

145808

17-Aug-21

03:40

osfui.dll

osfui.dll

16.0.5200.1000

343440

17-Aug-21

03:40

websb.dll

websandbox.dll

16.0.5215.1000

632208

18-Aug-21

02:51

File identifier

File name

File version

File size

Date

Time

osfintl.dll_1025

osfintl.dll

16.0.5215.1000

260896

18-Aug-21

03:30

osfintl.dll_1026

osfintl.dll

16.0.5215.1000

262968

18-Aug-21

02:58

osfintl.dll_1029

osfintl.dll

16.0.5215.1000

259432

18-Aug-21

03:30

osfintl.dll_1030

osfintl.dll

16.0.5215.1000

257904

18-Aug-21

03:30

osfintl.dll_1031

osfintl.dll

16.0.5215.1000

259480

18-Aug-21

03:30

osfintl.dll_1032

osfintl.dll

16.0.5215.1000

266552

18-Aug-21

03:30

osfintl.dll_3082

osfintl.dll

16.0.5215.1000

256896

18-Aug-21

03:30

osfintl.dll_1061

osfintl.dll

16.0.5215.1000

255864

18-Aug-21

02:58

osfintl.dll_1035

osfintl.dll

16.0.5215.1000

255296

18-Aug-21

03:30

osfintl.dll_1036

osfintl.dll

16.0.5215.1000

260440

18-Aug-21

03:30

osfintl.dll_1037

osfintl.dll

16.0.5215.1000

255792

18-Aug-21

03:30

osfintl.dll_1081

osfintl.dll

16.0.5215.1000

269624

18-Aug-21

03:30

osfintl.dll_1050

osfintl.dll

16.0.5215.1000

256416

18-Aug-21

03:30

osfintl.dll_1038

osfintl.dll

16.0.5215.1000

260976

18-Aug-21

02:58

osfintl.dll_1057

osfintl.dll

16.0.5215.1000

254816

18-Aug-21

02:58

osfintl.dll_1040

osfintl.dll

16.0.5215.1000

258424

18-Aug-21

03:30

osfintl.dll_1041

osfintl.dll

16.0.5215.1000

259872

18-Aug-21

03:30

osfintl.dll_1087

osfintl.dll

16.0.5215.1000

265008

18-Aug-21

03:30

osfintl.dll_1042

osfintl.dll

16.0.5215.1000

258336

18-Aug-21

03:30

osfintl.dll_1063

osfintl.dll

16.0.5215.1000

258416

18-Aug-21

03:30

osfintl.dll_1062

osfintl.dll

16.0.5215.1000

259440

18-Aug-21

03:30

osfintl.dll_1086

osfintl.dll

16.0.5215.1000

255848

18-Aug-21

02:58

osfintl.dll_1044

osfintl.dll

16.0.5215.1000

254824

18-Aug-21

03:30

osfintl.dll_1043

osfintl.dll

16.0.5215.1000

257880

18-Aug-21

03:30

osfintl.dll_1045

osfintl.dll

16.0.5215.1000

258952

18-Aug-21

03:30

osfintl.dll_1046

osfintl.dll

16.0.5215.1000

256888

18-Aug-21

03:30

osfintl.dll_2070

osfintl.dll

16.0.5215.1000

256888

18-Aug-21

03:30

osfintl.dll_1048

osfintl.dll

16.0.5215.1000

262520

18-Aug-21

03:30

osfintl.dll_1049

osfintl.dll

16.0.5215.1000

263968

18-Aug-21

03:30

osfintl.dll_1051

osfintl.dll

16.0.5215.1000

259952

18-Aug-21

02:58

osfintl.dll_1060

osfintl.dll

16.0.5215.1000

256896

18-Aug-21

02:58

osfintl.dll_2074

osfintl.dll

16.0.5215.1000

256400

18-Aug-21

03:30

osfintl.dll_9242

osfintl.dll

16.0.5215.1000

258464

18-Aug-21

03:30

osfintl.dll_1053

osfintl.dll

16.0.5215.1000

255848

18-Aug-21

03:30

osfintl.dll_1054

osfintl.dll

16.0.5215.1000

265000

18-Aug-21

03:30

osfintl.dll_1055

osfintl.dll

16.0.5215.1000

258912

18-Aug-21

03:30

osfintl.dll_1058

osfintl.dll

16.0.5215.1000

263984

18-Aug-21

03:30

osfintl.dll_1066

osfintl.dll

16.0.5215.1000

260400

18-Aug-21

02:58

osfintl.dll_2052

osfintl.dll

16.0.5215.1000

253736

18-Aug-21

03:30

osfintl.dll_1028

osfintl.dll

16.0.5215.1000

253736

18-Aug-21

03:30

osfintl.dll_1033

osfintl.dll

16.0.5215.1000

253808

18-Aug-21

03:30

minsbproxy.dll

minsbproxy.dll

16.0.5215.1000

51576

18-Aug-21

02:51

minsbroamingproxy.dll

minsbroamingproxy.dll

16.0.5215.1000

51568

18-Aug-21

02:51

msosb.dll

msosb.dll

16.0.5215.1000

218480

18-Aug-21

02:51

osf.dll

osf.dll

16.0.5215.1000

1835400

18-Aug-21

02:53

osfproxy.dll

osfproxy.dll

16.0.5215.1000

51576

18-Aug-21

02:51

osfroamingproxy.dll

osfroamingproxy.dll

16.0.5215.1000

51584

18-Aug-21

02:51

osfshared.dll

osfshared.dll

16.0.5200.1000

228728

17-Aug-21

03:49

osfui.dll

osfui.dll

16.0.5200.1000

497496

17-Aug-21

03:49

websb.dll

websandbox.dll

16.0.5215.1000

893824

18-Aug-21

02:53

minsbproxy.dll

minsbproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:51

minsbproxy.dll.x86

minsbproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:58

minsbroamingproxy.dll

minsbroamingproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:51

minsbroamingproxy.dll.x86

minsbroamingproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:58

msosb.dll

msosb.dll

16.0.5215.1000

155504

18-Aug-21

02:51

msosb.dll.x86

msosb.dll

16.0.5215.1000

155504

18-Aug-21

02:58

osfproxy.dll

osfproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:51

osfproxy.dll.x86

osfproxy.dll

16.0.5215.1000

44424

18-Aug-21

02:58

osfroamingproxy.dll

osfroamingproxy.dll

16.0.5215.1000

44432

18-Aug-21

02:51

osfroamingproxy.dll.x86

osfroamingproxy.dll

16.0.5215.1000

44432

18-Aug-21

02:58

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