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Summary

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

Note To apply this security update, you must have the release version of Service Pack 1 for Microsoft Office 2013 installed on the computer.

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2013. It doesn't apply to the Office 2013 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 4018375.

File hash information

File name

SHA256 hash

osfclient2013-kb4484108-fullfile-x86-glb.exe

BFEE23A3325095E4FFE5C36EFBB8E33EF35768EB0F175411AD332E59705C1A27

osfclient2013-kb4484108-fullfile-x64-glb.exe

249BCC60EAD7F6A2BC474334D1B0DE396A3C2B86F5891DE89370733CC7CED72C

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

15.0.5381.1000

253344

18-Aug-21

09:00

osfintl.dll_1026

osfintl.dll

15.0.5381.1000

262040

18-Aug-21

08:21

osfintl.dll_1029

osfintl.dll

15.0.5381.1000

255384

18-Aug-21

09:00

osfintl.dll_1030

osfintl.dll

15.0.5381.1000

254872

18-Aug-21

09:00

osfintl.dll_1031

osfintl.dll

15.0.5381.1000

259480

18-Aug-21

09:00

osfintl.dll_1032

osfintl.dll

15.0.5381.1000

266664

18-Aug-21

09:00

osfintl.dll_3082

osfintl.dll

15.0.5381.1000

257944

18-Aug-21

09:00

osfintl.dll_1061

osfintl.dll

15.0.5381.1000

253336

18-Aug-21

08:21

osfintl.dll_1035

osfintl.dll

15.0.5381.1000

253848

18-Aug-21

09:00

osfintl.dll_1036

osfintl.dll

15.0.5381.1000

261536

18-Aug-21

09:00

osfintl.dll_1037

osfintl.dll

15.0.5381.1000

250776

18-Aug-21

09:00

osfintl.dll_1081

osfintl.dll

15.0.5381.1000

275856

18-Aug-21

09:00

osfintl.dll_1050

osfintl.dll

15.0.5381.1000

256920

18-Aug-21

09:00

osfintl.dll_1038

osfintl.dll

15.0.5381.1000

257944

18-Aug-21

08:21

osfintl.dll_1057

osfintl.dll

15.0.5381.1000

254880

18-Aug-21

08:21

osfintl.dll_1040

osfintl.dll

15.0.5381.1000

256920

18-Aug-21

09:00

osfintl.dll_1041

osfintl.dll

15.0.5381.1000

247192

18-Aug-21

09:00

osfintl.dll_1087

osfintl.dll

15.0.5381.1000

261520

18-Aug-21

09:00

osfintl.dll_1042

osfintl.dll

15.0.5381.1000

244640

18-Aug-21

09:00

osfintl.dll_1063

osfintl.dll

15.0.5381.1000

258456

18-Aug-21

09:00

osfintl.dll_1062

osfintl.dll

15.0.5381.1000

257432

18-Aug-21

09:00

osfintl.dll_1086

osfintl.dll

15.0.5381.1000

255392

18-Aug-21

08:21

osfintl.dll_1044

osfintl.dll

15.0.5381.1000

252840

18-Aug-21

09:00

osfintl.dll_1043

osfintl.dll

15.0.5381.1000

255896

18-Aug-21

09:00

osfintl.dll_1045

osfintl.dll

15.0.5381.1000

257432

18-Aug-21

09:00

osfintl.dll_1046

osfintl.dll

15.0.5381.1000

256920

18-Aug-21

09:00

osfintl.dll_2070

osfintl.dll

15.0.5381.1000

257432

18-Aug-21

09:00

osfintl.dll_1048

osfintl.dll

15.0.5381.1000

258456

18-Aug-21

09:00

osfintl.dll_1049

osfintl.dll

15.0.5381.1000

262568

18-Aug-21

09:00

osfintl.dll_1051

osfintl.dll

15.0.5381.1000

256920

18-Aug-21

08:21

osfintl.dll_1060

osfintl.dll

15.0.5381.1000

254872

18-Aug-21

08:22

osfintl.dll_2074

osfintl.dll

15.0.5381.1000

256408

18-Aug-21

09:00

osfintl.dll_1053

osfintl.dll

15.0.5381.1000

255392

18-Aug-21

09:00

osfintl.dll_1054

osfintl.dll

15.0.5381.1000

257960

18-Aug-21

09:00

osfintl.dll_1055

osfintl.dll

15.0.5381.1000

255904

18-Aug-21

09:00

osfintl.dll_1058

osfintl.dll

15.0.5381.1000

262056

18-Aug-21

09:00

osfintl.dll_1066

osfintl.dll

15.0.5381.1000

256408

18-Aug-21

08:22

osfintl.dll_2052

osfintl.dll

15.0.5381.1000

240024

18-Aug-21

09:00

osfintl.dll_1028

osfintl.dll

15.0.5381.1000

241048

18-Aug-21

09:00

osfintl.dll_1033

osfintl.dll

15.0.5381.1000

238472

17-Aug-21

08:18

msosb.dll

msosb.dll

15.0.4955.1000

68352

17-Aug-21

08:18

msosb.dll.x86

msosb.dll

15.0.4955.1000

68352

17-Aug-21

08:20

msoth.dll

msoth.dll

15.0.5381.1000

97680

17-Aug-21

08:18

msoth.dll.x86

msoth.dll

15.0.5381.1000

97680

17-Aug-21

08:20

osf.dll

osf.dll

15.0.5381.1000

1022344

17-Aug-21

08:18

osfproxy.dll

osfproxy.dll

15.0.5381.1000

31112

17-Aug-21

08:18

osfproxy.dll.x86

osfproxy.dll

15.0.5381.1000

31112

17-Aug-21

08:20

osfroamingproxy.dll

osfroamingproxy.dll

15.0.5381.1000

31120

17-Aug-21

08:18

osfroamingproxy.dll.x86

osfroamingproxy.dll

15.0.5381.1000

31120

17-Aug-21

08:20

osfshared.dll

osfshared.dll

15.0.5337.1000

120232

17-Aug-21

08:18

osfui.dll

osfui.dll

15.0.5345.1000

293272

17-Aug-21

08:18

File identifier

File name

File version

File size

Date

Time

osfintl.dll_1025

osfintl.dll

15.0.5381.1000

253336

18-Aug-21

09:10

osfintl.dll_1026

osfintl.dll

15.0.5381.1000

262040

18-Aug-21

08:30

osfintl.dll_1029

osfintl.dll

15.0.5381.1000

255392

18-Aug-21

09:10

osfintl.dll_1030

osfintl.dll

15.0.5381.1000

254872

18-Aug-21

09:10

osfintl.dll_1031

osfintl.dll

15.0.5381.1000

259480

18-Aug-21

09:10

osfintl.dll_1032

osfintl.dll

15.0.5381.1000

266648

18-Aug-21

09:10

osfintl.dll_3082

osfintl.dll

15.0.5381.1000

257944

18-Aug-21

09:10

osfintl.dll_1061

osfintl.dll

15.0.5381.1000

253328

18-Aug-21

08:30

osfintl.dll_1035

osfintl.dll

15.0.5381.1000

253848

18-Aug-21

09:10

osfintl.dll_1036

osfintl.dll

15.0.5381.1000

261536

18-Aug-21

09:10

osfintl.dll_1037

osfintl.dll

15.0.5381.1000

250776

18-Aug-21

09:10

osfintl.dll_1081

osfintl.dll

15.0.5381.1000

275864

18-Aug-21

09:10

osfintl.dll_1050

osfintl.dll

15.0.5381.1000

256928

18-Aug-21

09:10

osfintl.dll_1038

osfintl.dll

15.0.5381.1000

257960

18-Aug-21

08:30

osfintl.dll_1057

osfintl.dll

15.0.5381.1000

254872

18-Aug-21

08:30

osfintl.dll_1040

osfintl.dll

15.0.5381.1000

256920

18-Aug-21

09:10

osfintl.dll_1041

osfintl.dll

15.0.5381.1000

247192

18-Aug-21

09:10

osfintl.dll_1087

osfintl.dll

15.0.5381.1000

261536

18-Aug-21

09:10

osfintl.dll_1042

osfintl.dll

15.0.5381.1000

244640

18-Aug-21

09:10

osfintl.dll_1063

osfintl.dll

15.0.5381.1000

258456

18-Aug-21

09:10

osfintl.dll_1062

osfintl.dll

15.0.5381.1000

257432

18-Aug-21

09:10

osfintl.dll_1086

osfintl.dll

15.0.5381.1000

255384

18-Aug-21

08:30

osfintl.dll_1044

osfintl.dll

15.0.5381.1000

252824

18-Aug-21

09:10

osfintl.dll_1043

osfintl.dll

15.0.5381.1000

255912

18-Aug-21

09:10

osfintl.dll_1045

osfintl.dll

15.0.5381.1000

257432

18-Aug-21

09:10

osfintl.dll_1046

osfintl.dll

15.0.5381.1000

256928

18-Aug-21

09:10

osfintl.dll_2070

osfintl.dll

15.0.5381.1000

257432

18-Aug-21

09:10

osfintl.dll_1048

osfintl.dll

15.0.5381.1000

258464

18-Aug-21

09:10

osfintl.dll_1049

osfintl.dll

15.0.5381.1000

262536

18-Aug-21

09:10

osfintl.dll_1051

osfintl.dll

15.0.5381.1000

256912

18-Aug-21

08:30

osfintl.dll_1060

osfintl.dll

15.0.5381.1000

254888

18-Aug-21

08:30

osfintl.dll_2074

osfintl.dll

15.0.5381.1000

256400

18-Aug-21

09:10

osfintl.dll_1053

osfintl.dll

15.0.5381.1000

255384

18-Aug-21

09:10

osfintl.dll_1054

osfintl.dll

15.0.5381.1000

257952

18-Aug-21

09:10

osfintl.dll_1055

osfintl.dll

15.0.5381.1000

255896

18-Aug-21

09:10

osfintl.dll_1058

osfintl.dll

15.0.5381.1000

262040

18-Aug-21

09:10

osfintl.dll_1066

osfintl.dll

15.0.5381.1000

256408

18-Aug-21

08:30

osfintl.dll_2052

osfintl.dll

15.0.5381.1000

240016

18-Aug-21

09:10

osfintl.dll_1028

osfintl.dll

15.0.5381.1000

241048

18-Aug-21

09:10

osfintl.dll_1033

osfintl.dll

15.0.5381.1000

238504

17-Aug-21

08:18

msosb.dll

msosb.dll

15.0.4955.1000

90368

17-Aug-21

08:18

msoth.dll

msoth.dll

15.0.5381.1000

134552

17-Aug-21

08:18

osf.dll

osf.dll

15.0.5381.1000

1523608

17-Aug-21

08:18

osfproxy.dll

osfproxy.dll

15.0.5381.1000

37784

17-Aug-21

08:18

osfroamingproxy.dll

osfroamingproxy.dll

15.0.5381.1000

37776

17-Aug-21

08:18

osfshared.dll

osfshared.dll

15.0.5337.1000

184728

17-Aug-21

08:18

osfui.dll

osfui.dll

15.0.5345.1000

449440

17-Aug-21

08:18

msosb.dll

msosb.dll

15.0.4955.1000

68352

17-Aug-21

08:18

msosb.dll.x86

msosb.dll

15.0.4955.1000

68352

17-Aug-21

08:20

msoth.dll

msoth.dll

15.0.5381.1000

97680

17-Aug-21

08:18

msoth.dll.x86

msoth.dll

15.0.5381.1000

97680

17-Aug-21

08:20

osfproxy.dll

osfproxy.dll

15.0.5381.1000

31112

17-Aug-21

08:18

osfproxy.dll.x86

osfproxy.dll

15.0.5381.1000

31112

17-Aug-21

08:20

osfroamingproxy.dll

osfroamingproxy.dll

15.0.5381.1000

31120

17-Aug-21

08:18

osfroamingproxy.dll.x86

osfroamingproxy.dll

15.0.5381.1000

31120

17-Aug-21

08:20

Information about protection and security

Protect yourself online: Windows Security support

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