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Summary

An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploits this vulnerability could craft a special packet. This could cause an information disclosure from the server.

To learn more about the vulnerability, go to the Security Update Guide.

More Information

Important

  • If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

How to obtain and install the update

Method 1: Windows Update

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

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Deployment information

For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:

Security update deployment information: May 9, 2017

More Information

Help for installing updates: Windows Update FAQ

Security solutions for IT professionals: TechNet Security Support and Troubleshooting

Help for protecting your Windows-based computer from viruses and malware: Microsoft Secure

Local support according to your country: International Support

File Information

File name

SHA1 hash

SHA256 hash

Windows6.0-KB4018466-ia64.msu

C3F75846826AD3992FBC2D7A8C57A85F7F0A397C

38D980BA623A0AD5695DB70F6CA0B49A9A1069EE304DCF1FF4F4411823EBC0C7

Windows6.0-KB4018466-x64.msu

716403222008343DAD1A9964E1C45787E51A8792

5DF45753B06958D0DA1FE1E4DF6C74A504D0BA23E5FE005A09DBDA07D18CB448

Windows6.0-KB4018466-x86.msu

33843FD20FDD7D88A77C6AC5BA02145641EDE966

FBC2257442A6ED0351FB677F93A8FB71A2C2BD64B73D23F63D7668D1440D760A


File information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

Windows Server 2008 file information

Note: The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

File name

File version

File size

Date

Time

Platform

Netevent.dll.mui

6.0.6002.19673

270,336

03-Aug-2016

16:57

Not applicable

Netevent.dll.mui

6.0.6002.19673

230,912

03-Aug-2016

15:36

Not applicable

Netevent.dll.mui

6.0.6002.19673

270,848

03-Aug-2016

17:01

Not applicable

Netevent.dll.mui

6.0.6002.19673

144,384

03-Aug-2016

16:49

Not applicable

Netevent.dll.mui

6.0.6002.19673

137,216

03-Aug-2016

17:04

Not applicable

Netevent.dll.mui

6.0.6002.19673

99,840

03-Aug-2016

17:00

Not applicable

Netevent.dll.mui

6.0.6002.19673

101,376

03-Aug-2016

16:55

Not applicable

Netevent.dll.mui

6.0.6002.24089

270,336

07-Apr-2017

16:51

Not applicable

Netevent.dll.mui

6.0.6002.24089

230,912

07-Apr-2017

15:22

Not applicable

Netevent.dll.mui

6.0.6002.24089

270,848

07-Apr-2017

16:42

Not applicable

Netevent.dll.mui

6.0.6002.24089

144,384

07-Apr-2017

16:54

Not applicable

Netevent.dll.mui

6.0.6002.24089

137,216

07-Apr-2017

16:49

Not applicable

Netevent.dll.mui

6.0.6002.24089

99,840

07-Apr-2017

16:53

Not applicable

Netevent.dll.mui

6.0.6002.24089

101,376

07-Apr-2017

16:45

Not applicable

Netevent.dll

6.0.6002.19673

17,920

03-Aug-2016

15:35

IA-64

Netevent.dll

6.0.6002.24089

17,920

07-Apr-2017

15:17

IA-64

Srvnet.sys

6.0.6002.19673

297,984

03-Aug-2016

14:20

IA-64

Srvnet.sys

6.0.6002.24089

297,984

07-Apr-2017

14:21

IA-64

Srv.sys

6.0.6002.19765

967,168

07-Apr-2017

14:21

IA-64

Srv.sys

6.0.6002.24089

969,216

07-Apr-2017

14:22

IA-64

Srv2.sys

6.0.6002.19765

468,480

07-Apr-2017

14:21

IA-64

Srv2.sys

6.0.6002.24089

474,624

07-Apr-2017

14:21

IA-64

Netevent.dll.mui

6.0.6002.19673

278,528

03-Aug-2016

16:20

Not applicable

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

15:44

Not applicable

Netevent.dll.mui

6.0.6002.19673

278,528

03-Aug-2016

16:19

Not applicable

Netevent.dll.mui

6.0.6002.19673

155,648

03-Aug-2016

16:38

Not applicable

Netevent.dll.mui

6.0.6002.19673

147,456

03-Aug-2016

16:31

Not applicable

Netevent.dll.mui

6.0.6002.19673

110,592

03-Aug-2016

16:39

Not applicable

Netevent.dll.mui

6.0.6002.19673

110,592

03-Aug-2016

16:27

Not applicable

Netevent.dll.mui

6.0.6002.24089

278,528

07-Apr-2017

16:20

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

15:26

Not applicable

Netevent.dll.mui

6.0.6002.24089

278,528

07-Apr-2017

16:35

Not applicable

Netevent.dll.mui

6.0.6002.24089

155,648

07-Apr-2017

16:34

Not applicable

Netevent.dll.mui

6.0.6002.24089

147,456

07-Apr-2017

16:25

Not applicable

Netevent.dll.mui

6.0.6002.24089

110,592

07-Apr-2017

16:38

Not applicable

Netevent.dll.mui

6.0.6002.24089

110,592

07-Apr-2017

16:33

Not applicable

Netevent.dll

6.0.6002.19673

17,920

03-Aug-2016

15:45

x86

Netevent.dll

6.0.6002.24089

17,920

07-Apr-2017

15:24

x86

File name

File version

File size

Date

Time

Platform

Netevent.dll.mui

6.0.6002.19673

233,984

03-Aug-2016

17:08

Not applicable

Netevent.dll.mui

6.0.6002.19673

239,104

03-Aug-2016

17:08

Not applicable

Netevent.dll.mui

6.0.6002.19673

270,336

03-Aug-2016

17:06

Not applicable

Netevent.dll.mui

6.0.6002.19673

289,792

03-Aug-2016

17:03

Not applicable

Netevent.dll.mui

6.0.6002.19673

230,912

03-Aug-2016

16:23

Not applicable

Netevent.dll.mui

6.0.6002.19673

263,168

03-Aug-2016

17:04

Not applicable

Netevent.dll.mui

6.0.6002.19673

229,376

03-Aug-2016

17:05

Not applicable

Netevent.dll.mui

6.0.6002.19673

270,848

03-Aug-2016

17:08

Not applicable

Netevent.dll.mui

6.0.6002.19673

253,440

03-Aug-2016

17:10

Not applicable

Netevent.dll.mui

6.0.6002.19673

262,144

03-Aug-2016

17:11

Not applicable

Netevent.dll.mui

6.0.6002.19673

144,384

03-Aug-2016

17:15

Not applicable

Netevent.dll.mui

6.0.6002.19673

137,216

03-Aug-2016

17:07

Not applicable

Netevent.dll.mui

6.0.6002.19673

229,376

03-Aug-2016

17:16

Not applicable

Netevent.dll.mui

6.0.6002.19673

253,952

03-Aug-2016

17:09

Not applicable

Netevent.dll.mui

6.0.6002.19673

248,320

03-Aug-2016

17:02

Not applicable

Netevent.dll.mui

6.0.6002.19673

253,440

03-Aug-2016

17:09

Not applicable

Netevent.dll.mui

6.0.6002.19673

261,120

03-Aug-2016

17:12

Not applicable

Netevent.dll.mui

6.0.6002.19673

241,152

03-Aug-2016

17:11

Not applicable

Netevent.dll.mui

6.0.6002.19673

231,936

03-Aug-2016

17:10

Not applicable

Netevent.dll.mui

6.0.6002.19673

230,912

03-Aug-2016

17:12

Not applicable

Netevent.dll.mui

6.0.6002.19673

99,840

03-Aug-2016

17:08

Not applicable

Netevent.dll.mui

6.0.6002.19673

101,376

03-Aug-2016

17:12

Not applicable

Netevent.dll.mui

6.0.6002.24089

233,984

07-Apr-2017

16:47

Not applicable

Netevent.dll.mui

6.0.6002.24089

239,104

07-Apr-2017

16:47

Not applicable

Netevent.dll.mui

6.0.6002.24089

270,336

07-Apr-2017

16:55

Not applicable

Netevent.dll.mui

6.0.6002.24089

289,792

07-Apr-2017

16:56

Not applicable

Netevent.dll.mui

6.0.6002.24089

230,912

07-Apr-2017

15:45

Not applicable

Netevent.dll.mui

6.0.6002.24089

263,168

07-Apr-2017

16:58

Not applicable

Netevent.dll.mui

6.0.6002.24089

229,376

07-Apr-2017

16:56

Not applicable

Netevent.dll.mui

6.0.6002.24089

270,848

07-Apr-2017

16:47

Not applicable

Netevent.dll.mui

6.0.6002.24089

253,440

07-Apr-2017

16:49

Not applicable

Netevent.dll.mui

6.0.6002.24089

262,144

07-Apr-2017

17:02

Not applicable

Netevent.dll.mui

6.0.6002.24089

144,384

07-Apr-2017

17:01

Not applicable

Netevent.dll.mui

6.0.6002.24089

137,216

07-Apr-2017

16:53

Not applicable

Netevent.dll.mui

6.0.6002.24089

229,376

07-Apr-2017

17:01

Not applicable

Netevent.dll.mui

6.0.6002.24089

253,952

07-Apr-2017

17:01

Not applicable

Netevent.dll.mui

6.0.6002.24089

248,320

07-Apr-2017

16:48

Not applicable

Netevent.dll.mui

6.0.6002.24089

253,440

07-Apr-2017

16:56

Not applicable

Netevent.dll.mui

6.0.6002.24089

261,120

07-Apr-2017

16:58

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,152

07-Apr-2017

16:55

Not applicable

Netevent.dll.mui

6.0.6002.24089

231,936

07-Apr-2017

16:55

Not applicable

Netevent.dll.mui

6.0.6002.24089

230,912

07-Apr-2017

16:57

Not applicable

Netevent.dll.mui

6.0.6002.24089

99,840

07-Apr-2017

16:52

Not applicable

Netevent.dll.mui

6.0.6002.24089

101,376

07-Apr-2017

16:53

Not applicable

Netevent.dll

6.0.6002.19673

17,920

03-Aug-2016

16:23

x64

Netevent.dll

6.0.6002.24089

17,920

07-Apr-2017

15:43

x64

Srvnet.sys

6.0.6002.19673

147,456

03-Aug-2016

14:40

x64

Srvnet.sys

6.0.6002.24089

147,968

07-Apr-2017

14:42

x64

Srv.sys

6.0.6002.19765

446,464

07-Apr-2017

14:43

x64

Srv.sys

6.0.6002.24089

445,440

07-Apr-2017

14:42

x64

Srv2.sys

6.0.6002.19765

176,128

07-Apr-2017

14:42

x64

Srv2.sys

6.0.6002.24089

178,176

07-Apr-2017

14:42

x64

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

16:22

Not applicable

Netevent.dll.mui

6.0.6002.19673

249,856

03-Aug-2016

16:21

Not applicable

Netevent.dll.mui

6.0.6002.19673

278,528

03-Aug-2016

16:20

Not applicable

Netevent.dll.mui

6.0.6002.19673

299,008

03-Aug-2016

16:28

Not applicable

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

15:44

Not applicable

Netevent.dll.mui

6.0.6002.19673

274,432

03-Aug-2016

16:19

Not applicable

Netevent.dll.mui

6.0.6002.19673

237,568

03-Aug-2016

16:29

Not applicable

Netevent.dll.mui

6.0.6002.19673

278,528

03-Aug-2016

16:19

Not applicable

Netevent.dll.mui

6.0.6002.19673

262,144

03-Aug-2016

16:33

Not applicable

Netevent.dll.mui

6.0.6002.19673

270,336

03-Aug-2016

16:40

Not applicable

Netevent.dll.mui

6.0.6002.19673

155,648

03-Aug-2016

16:38

Not applicable

Netevent.dll.mui

6.0.6002.19673

147,456

03-Aug-2016

16:31

Not applicable

Netevent.dll.mui

6.0.6002.19673

237,568

03-Aug-2016

16:27

Not applicable

Netevent.dll.mui

6.0.6002.19673

262,144

03-Aug-2016

16:39

Not applicable

Netevent.dll.mui

6.0.6002.19673

258,048

03-Aug-2016

16:40

Not applicable

Netevent.dll.mui

6.0.6002.19673

262,144

03-Aug-2016

16:40

Not applicable

Netevent.dll.mui

6.0.6002.19673

270,336

03-Aug-2016

16:32

Not applicable

Netevent.dll.mui

6.0.6002.19673

249,856

03-Aug-2016

16:33

Not applicable

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

16:35

Not applicable

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

16:35

Not applicable

Netevent.dll.mui

6.0.6002.19673

110,592

03-Aug-2016

16:39

Not applicable

Netevent.dll.mui

6.0.6002.19673

110,592

03-Aug-2016

16:27

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

16:38

Not applicable

Netevent.dll.mui

6.0.6002.24089

249,856

07-Apr-2017

16:22

Not applicable

Netevent.dll.mui

6.0.6002.24089

278,528

07-Apr-2017

16:20

Not applicable

Netevent.dll.mui

6.0.6002.24089

299,008

07-Apr-2017

16:19

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

15:26

Not applicable

Netevent.dll.mui

6.0.6002.24089

274,432

07-Apr-2017

16:36

Not applicable

Netevent.dll.mui

6.0.6002.24089

237,568

07-Apr-2017

16:34

Not applicable

Netevent.dll.mui

6.0.6002.24089

278,528

07-Apr-2017

16:35

Not applicable

Netevent.dll.mui

6.0.6002.24089

262,144

07-Apr-2017

16:29

Not applicable

Netevent.dll.mui

6.0.6002.24089

270,336

07-Apr-2017

16:30

Not applicable

Netevent.dll.mui

6.0.6002.24089

155,648

07-Apr-2017

16:34

Not applicable

Netevent.dll.mui

6.0.6002.24089

147,456

07-Apr-2017

16:25

Not applicable

Netevent.dll.mui

6.0.6002.24089

237,568

07-Apr-2017

16:21

Not applicable

Netevent.dll.mui

6.0.6002.24089

262,144

07-Apr-2017

16:35

Not applicable

Netevent.dll.mui

6.0.6002.24089

258,048

07-Apr-2017

16:35

Not applicable

Netevent.dll.mui

6.0.6002.24089

262,144

07-Apr-2017

16:44

Not applicable

Netevent.dll.mui

6.0.6002.24089

270,336

07-Apr-2017

16:42

Not applicable

Netevent.dll.mui

6.0.6002.24089

249,856

07-Apr-2017

16:39

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

16:30

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

16:22

Not applicable

Netevent.dll.mui

6.0.6002.24089

110,592

07-Apr-2017

16:38

Not applicable

Netevent.dll.mui

6.0.6002.24089

110,592

07-Apr-2017

16:33

Not applicable

Netevent.dll

6.0.6002.19673

17,920

03-Aug-2016

15:45

x86

Netevent.dll

6.0.6002.24089

17,920

07-Apr-2017

15:24

x86

File name

File version

File size

Date

Time

Platform

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

16:22

Not applicable

Netevent.dll.mui

6.0.6002.19673

249,856

03-Aug-2016

16:21

Not applicable

Netevent.dll.mui

6.0.6002.19673

278,528

03-Aug-2016

16:20

Not applicable

Netevent.dll.mui

6.0.6002.19673

299,008

03-Aug-2016

16:28

Not applicable

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

15:44

Not applicable

Netevent.dll.mui

6.0.6002.19673

274,432

03-Aug-2016

16:19

Not applicable

Netevent.dll.mui

6.0.6002.19673

237,568

03-Aug-2016

16:29

Not applicable

Netevent.dll.mui

6.0.6002.19673

278,528

03-Aug-2016

16:19

Not applicable

Netevent.dll.mui

6.0.6002.19673

262,144

03-Aug-2016

16:33

Not applicable

Netevent.dll.mui

6.0.6002.19673

270,336

03-Aug-2016

16:40

Not applicable

Netevent.dll.mui

6.0.6002.19673

155,648

03-Aug-2016

16:38

Not applicable

Netevent.dll.mui

6.0.6002.19673

147,456

03-Aug-2016

16:31

Not applicable

Netevent.dll.mui

6.0.6002.19673

237,568

03-Aug-2016

16:27

Not applicable

Netevent.dll.mui

6.0.6002.19673

262,144

03-Aug-2016

16:39

Not applicable

Netevent.dll.mui

6.0.6002.19673

258,048

03-Aug-2016

16:40

Not applicable

Netevent.dll.mui

6.0.6002.19673

262,144

03-Aug-2016

16:40

Not applicable

Netevent.dll.mui

6.0.6002.19673

270,336

03-Aug-2016

16:32

Not applicable

Netevent.dll.mui

6.0.6002.19673

249,856

03-Aug-2016

16:33

Not applicable

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

16:35

Not applicable

Netevent.dll.mui

6.0.6002.19673

241,664

03-Aug-2016

16:35

Not applicable

Netevent.dll.mui

6.0.6002.19673

110,592

03-Aug-2016

16:39

Not applicable

Netevent.dll.mui

6.0.6002.19673

110,592

03-Aug-2016

16:27

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

16:38

Not applicable

Netevent.dll.mui

6.0.6002.24089

249,856

07-Apr-2017

16:22

Not applicable

Netevent.dll.mui

6.0.6002.24089

278,528

07-Apr-2017

16:20

Not applicable

Netevent.dll.mui

6.0.6002.24089

299,008

07-Apr-2017

16:19

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

15:26

Not applicable

Netevent.dll.mui

6.0.6002.24089

274,432

07-Apr-2017

16:36

Not applicable

Netevent.dll.mui

6.0.6002.24089

237,568

07-Apr-2017

16:34

Not applicable

Netevent.dll.mui

6.0.6002.24089

278,528

07-Apr-2017

16:35

Not applicable

Netevent.dll.mui

6.0.6002.24089

262,144

07-Apr-2017

16:29

Not applicable

Netevent.dll.mui

6.0.6002.24089

270,336

07-Apr-2017

16:30

Not applicable

Netevent.dll.mui

6.0.6002.24089

155,648

07-Apr-2017

16:34

Not applicable

Netevent.dll.mui

6.0.6002.24089

147,456

07-Apr-2017

16:25

Not applicable

Netevent.dll.mui

6.0.6002.24089

237,568

07-Apr-2017

16:21

Not applicable

Netevent.dll.mui

6.0.6002.24089

262,144

07-Apr-2017

16:35

Not applicable

Netevent.dll.mui

6.0.6002.24089

258,048

07-Apr-2017

16:35

Not applicable

Netevent.dll.mui

6.0.6002.24089

262,144

07-Apr-2017

16:44

Not applicable

Netevent.dll.mui

6.0.6002.24089

270,336

07-Apr-2017

16:42

Not applicable

Netevent.dll.mui

6.0.6002.24089

249,856

07-Apr-2017

16:39

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

16:30

Not applicable

Netevent.dll.mui

6.0.6002.24089

241,664

07-Apr-2017

16:22

Not applicable

Netevent.dll.mui

6.0.6002.24089

110,592

07-Apr-2017

16:38

Not applicable

Netevent.dll.mui

6.0.6002.24089

110,592

07-Apr-2017

16:33

Not applicable

Netevent.dll

6.0.6002.19673

17,920

03-Aug-2016

15:45

x86

Netevent.dll

6.0.6002.24089

17,920

07-Apr-2017

15:24

x86

Srvnet.sys

6.0.6002.19673

103,936

03-Aug-2016

14:20

x86

Srvnet.sys

6.0.6002.24089

103,936

07-Apr-2017

14:22

x86

Srv.sys

6.0.6002.19765

305,152

07-Apr-2017

14:19

x86

Srv.sys

6.0.6002.24089

305,152

07-Apr-2017

14:22

x86

Srv2.sys

6.0.6002.19765

146,432

07-Apr-2017

14:19

x86

Srv2.sys

6.0.6002.24089

148,480

07-Apr-2017

14:22

x86

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