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This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) makes sure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.
This update also addresses an elevation of privilege vulnerability that exists when the Windows Modules Installer improperly handles file operations. An attacker who successfully exploited this vulnerability could gain elevated privileges. The security update addresses the vulnerability by ensuring the Windows Modules Installer properly handles file operations. For more information, see CVE-2020-1346 | Windows Modules Installer Elevation of Privilege Vulnerability.
This update is available through Windows Update. It will be downloaded and installed automatically.
To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
This update is also available through Windows Server Update Services (WSUS).
There are no prerequisites to apply this update.
You don't have to restart your computer after you apply this update.
Servicing stack updates (SSUs) make changes to how updates are installed and cannot be uninstalled from the device.
This update replaces the previously released update KB4562252.
| File name | SHA1 hash | SHA256 hash |
|---|---|---|
| Windows8-RT-KB4566426-x64.msu | ED3F2C06D774AF0138D4CA3E17B7151CBC5D0FC5 | 5B8B52C30A1A042E3A4A8F3AD9A913B2F50EF6765DB742DD213FFABDA89DAD98 |
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.
The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
| File name | File version | File size | Date | Time |
| Cbsapi.dll | 6.2.9200.16384 | 23,040 | 26-Jul-2012 | 03:05 |
| Esscli.dll | 6.2.9200.22865 | 385,024 | 17-Aug-2019 | 17:10 |
| Fastprox.dll | 6.2.9200.22865 | 816,640 | 17-Aug-2019 | 17:10 |
| Mofd.dll | 6.2.9200.23084 | 259,584 | 11-Jun-2020 | 04:11 |
| Mofinstall.dll | 6.2.9200.23084 | 71,168 | 11-Jun-2020 | 04:11 |
| Repdrvfs.dll | 6.2.9200.16384 | 366,080 | 26-Jul-2012 | 03:07 |
| Wbemcomn.dll | 6.2.9200.22865 | 462,336 | 17-Aug-2019 | 17:10 |
| Wbemcore.dll | 6.2.9200.23084 | 1,207,296 | 11-Jun-2020 | 04:11 |
| Wbemprox.dll | 6.2.9200.16384 | 35,840 | 26-Jul-2012 | 03:07 |
| Wmicmiplugin.dll | 6.2.9200.23060 | 556,032 | 15-May-2020 | 05:35 |
| Wmiutils.dll | 6.2.9200.16384 | 115,712 | 26-Jul-2012 | 03:07 |
| Sppinst.dll | 6.2.9200.21193 | 641,024 | 09-Aug-2014 | 06:56 |
| Cmifw.dll | 6.2.9200.16384 | 88,576 | 26-Jul-2012 | 03:05 |
| Firewallofflineapi.dll | 6.2.9200.16384 | 211,968 | 26-Jul-2012 | 03:05 |
| Appserverai.dll | 6.2.9200.23084 | 135,680 | 11-Jun-2020 | 04:11 |
| Rdwebai.dll | 6.2.9200.22882 | 126,976 | 17-Sep-2019 | 04:31 |
| Tssdisai.dll | 6.2.9200.23084 | 145,408 | 11-Jun-2020 | 04:11 |
| Vmhostai.dll | 6.2.9200.23084 | 123,392 | 11-Jun-2020 | 04:11 |
| Appxreg.dll | 6.2.9200.16384 | 15,360 | 26-Jul-2012 | 03:05 |
| Bcdeditai.dll | 6.2.9200.21193 | 300,032 | 09-Aug-2014 | 06:55 |
| Bfsvc.dll | 6.2.9200.16384 | 91,648 | 26-Jul-2012 | 03:05 |
| Cbscore.dll | 6.2.9200.23084 | 1,163,776 | 11-Jun-2020 | 04:11 |
| Cbsmsg.dll | 6.2.9200.16384 | 41,472 | 26-Jul-2012 | 03:05 |
| Ceipfwdai.dll | 6.2.9200.23060 | 212,480 | 15-May-2020 | 05:34 |
| Cleanupai.dll | 6.2.9200.16384 | 31,232 | 26-Jul-2012 | 03:05 |
| Cmiadapter.dll | 6.2.9200.22882 | 116,736 | 17-Sep-2019 | 04:30 |
| Cmipnpinstall.dll | 6.2.9200.23084 | 250,880 | 11-Jun-2020 | 04:11 |
| Cmitrust.dll | 6.2.9200.22865 | 407,040 | 17-Aug-2019 | 17:10 |
| Cmiv2.dll | 6.2.9200.23084 | 3,298,816 | 11-Jun-2020 | 04:11 |
| Cntrtextinstaller.dll | 6.2.9200.16384 | 164,864 | 26-Jul-2012 | 03:05 |
| Configureieoptionalcomponentsai.dll | 6.2.9200.22882 | 73,216 | 17-Sep-2019 | 04:30 |
| Dpx.dll | 6.2.9200.23060 | 362,496 | 15-May-2020 | 05:34 |
| Drupdate.dll | 6.2.9200.22865 | 244,224 | 17-Aug-2019 | 17:10 |
| Drvstore.dll | 6.2.9200.22865 | 703,488 | 17-Aug-2019 | 17:10 |
| Fveupdateai.dll | 6.2.9200.22882 | 57,344 | 17-Sep-2019 | 04:30 |
| Globalinstallorder.xml | Not applicable | 2,240,509 | 02-Jun-2012 | 20:26 |
| Httpai.dll | 6.2.9200.22882 | 52,224 | 17-Sep-2019 | 04:30 |
| Iefileinstallai.dll | 6.2.9200.22882 | 58,880 | 17-Sep-2019 | 04:30 |
| Luainstall.dll | 6.2.9200.16384 | 50,176 | 26-Jul-2012 | 03:06 |
| Msdelta.dll | 6.2.9200.23084 | 414,208 | 11-Jun-2020 | 04:11 |
| Msdtcadvancedinstaller.dll | 6.2.9200.23060 | 239,616 | 15-May-2020 | 05:35 |
| Mspatcha.dll | 6.2.9200.16384 | 45,056 | 26-Jul-2012 | 03:07 |
| Netfxconfig.dll | 6.2.9200.16384 | 34,304 | 26-Jul-2012 | 03:06 |
| Peerdistai.dll | 6.2.9200.22882 | 67,584 | 17-Sep-2019 | 04:31 |
| Pkgmgr.exe | 6.2.9200.22865 | 196,096 | 17-Aug-2019 | 17:10 |
| Poqexec.exe | 6.2.9200.23060 | 148,480 | 15-May-2020 | 05:35 |
| Printadvancedinstaller.dll | 6.2.9200.22865 | 71,168 | 17-Aug-2019 | 17:10 |
| Registeriepkeysai.dll | 6.2.9200.16384 | 19,456 | 26-Jul-2012 | 03:07 |
| Securebootai.dll | 6.2.9200.22882 | 36,352 | 17-Sep-2019 | 04:31 |
| Servicemodelregai.dll | 6.2.9200.22882 | 116,224 | 17-Sep-2019 | 04:31 |
| Setieinstalleddateai.dll | 6.2.9200.22882 | 42,496 | 17-Sep-2019 | 04:31 |
| Smiengine.dll | 6.2.9200.23060 | 894,464 | 15-May-2020 | 05:35 |
| Smipi.dll | 6.2.9200.22882 | 110,592 | 17-Sep-2019 | 04:31 |
| Tifilefetcher.exe | 6.2.9200.23060 | 460,800 | 15-May-2020 | 05:35 |
| Timezoneai.dll | 6.2.9200.16384 | 75,264 | 26-Jul-2012 | 03:07 |
| Tiworker.exe | 6.2.9200.21193 | 189,440 | 09-Aug-2014 | 06:57 |
| Wcmtypes.xsd | Not applicable | 1,047 | 02-Jun-2012 | 14:54 |
| Wcp.dll | 6.2.9200.23084 | 2,835,456 | 11-Jun-2020 | 04:11 |
| Wdscore.dll | 6.2.9200.22865 | 272,384 | 17-Aug-2019 | 17:10 |
| Winsockai.dll | 6.2.9200.16384 | 60,928 | 26-Jul-2012 | 03:07 |
| Wrpint.dll | 6.2.9200.16384 | 60,928 | 26-Jul-2012 | 03:08 |
| Ws2_helper.dll | 6.2.9200.16384 | 59,904 | 26-Jul-2012 | 03:08 |
| Trustedinstaller.exe | 6.2.9200.21193 | 98,304 | 09-Aug-2014 | 06:57 |
| Esscli.dll | 6.2.9200.16384 | 283,648 | 26-Jul-2012 | 03:19 |
| Fastprox.dll | 6.2.9200.22865 | 629,248 | 17-Aug-2019 | 16:15 |
| Mofd.dll | 6.2.9200.23084 | 196,096 | 11-Jun-2020 | 03:15 |
| Mofinstall.dll | 6.2.9200.16384 | 61,440 | 26-Jul-2012 | 03:19 |
| Repdrvfs.dll | 6.2.9200.16384 | 274,944 | 26-Jul-2012 | 03:19 |
| Wbemcomn.dll | 6.2.9200.21193 | 380,928 | 09-Aug-2014 | 06:36 |
| Wbemcore.dll | 6.2.9200.23084 | 924,672 | 11-Jun-2020 | 03:15 |
| Wbemprox.dll | 6.2.9200.16384 | 28,160 | 26-Jul-2012 | 03:19 |
| Wmicmiplugin.dll | 6.2.9200.23084 | 395,776 | 11-Jun-2020 | 03:15 |
| Wmiutils.dll | 6.2.9200.16384 | 88,576 | 26-Jul-2012 | 03:19 |
| Sppinst.dll | 6.2.9200.21193 | 518,656 | 09-Aug-2014 | 06:36 |
| Cmifw.dll | 6.2.9200.16384 | 73,728 | 26-Jul-2012 | 03:18 |
| Firewallofflineapi.dll | 6.2.9200.16384 | 181,760 | 26-Jul-2012 | 03:18 |
| Appxreg.dll | 6.2.9200.16384 | 22,016 | 26-Jul-2012 | 03:17 |
| Bcdeditai.dll | 6.2.9200.21193 | 285,184 | 09-Aug-2014 | 06:35 |
| Bfsvc.dll | 6.2.9200.16384 | 91,136 | 26-Jul-2012 | 03:18 |
| Cbscore.dll | 6.2.9200.23084 | 1,008,128 | 11-Jun-2020 | 03:15 |
| Cbsmsg.dll | 6.2.9200.16384 | 41,472 | 26-Jul-2012 | 03:18 |
| Ceipfwdai.dll | 6.2.9200.23060 | 180,736 | 15-May-2020 | 04:38 |
| Cleanupai.dll | 6.2.9200.16384 | 36,352 | 26-Jul-2012 | 03:18 |
| Cmiadapter.dll | 6.2.9200.22865 | 103,936 | 17-Aug-2019 | 16:15 |
| Cmipnpinstall.dll | 6.2.9200.23084 | 190,976 | 11-Jun-2020 | 03:15 |
| Cmitrust.dll | 6.2.9200.21913 | 289,280 | 23-Jun-2016 | 01:48 |
| Cmiv2.dll | 6.2.9200.23084 | 2,159,616 | 11-Jun-2020 | 03:15 |
| Cntrtextinstaller.dll | 6.2.9200.22865 | 139,776 | 17-Aug-2019 | 16:15 |
| Configureieoptionalcomponentsai.dll | 6.2.9200.22865 | 69,632 | 17-Aug-2019 | 16:15 |
| Dpx.dll | 6.2.9200.22865 | 250,368 | 17-Aug-2019 | 16:15 |
| Drupdate.dll | 6.2.9200.23060 | 193,024 | 15-May-2020 | 04:38 |
| Drvstore.dll | 6.2.9200.23060 | 549,376 | 15-May-2020 | 04:38 |
| Fveupdateai.dll | 6.2.9200.22865 | 56,320 | 17-Aug-2019 | 16:15 |
| Globalinstallorder.xml | Not applicable | 2,240,509 | 02-Jun-2012 | 20:26 |
| Httpai.dll | 6.2.9200.22865 | 53,760 | 17-Aug-2019 | 16:15 |
| Iefileinstallai.dll | 6.2.9200.22865 | 59,904 | 17-Aug-2019 | 16:15 |
| Luainstall.dll | 6.2.9200.16384 | 39,424 | 26-Jul-2012 | 03:18 |
| Msdelta.dll | 6.2.9200.23084 | 310,784 | 11-Jun-2020 | 03:15 |
| Msdtcadvancedinstaller.dll | 6.2.9200.23060 | 200,704 | 15-May-2020 | 04:38 |
| Mspatcha.dll | 6.2.9200.16384 | 38,912 | 26-Jul-2012 | 03:19 |
| Netfxconfig.dll | 6.2.9200.16384 | 40,448 | 26-Jul-2012 | 03:19 |
| Peerdistai.dll | 6.2.9200.22865 | 66,048 | 17-Aug-2019 | 16:15 |
| Pkgmgr.exe | 6.2.9200.22865 | 194,048 | 17-Aug-2019 | 16:15 |
| Poqexec.exe | 6.2.9200.22903 | 132,608 | 11-Oct-2019 | 15:17 |
| Printadvancedinstaller.dll | 6.2.9200.23060 | 72,704 | 15-May-2020 | 04:38 |
| Registeriepkeysai.dll | 6.2.9200.16384 | 24,576 | 26-Jul-2012 | 03:19 |
| Securebootai.dll | 6.2.9200.22882 | 39,936 | 17-Sep-2019 | 03:35 |
| Servicemodelregai.dll | 6.2.9200.23060 | 96,768 | 15-May-2020 | 04:38 |
| Setieinstalleddateai.dll | 6.2.9200.22865 | 41,984 | 17-Aug-2019 | 16:15 |
| Smiengine.dll | 6.2.9200.23060 | 700,928 | 15-May-2020 | 04:38 |
| Smipi.dll | 6.2.9200.22865 | 102,400 | 17-Aug-2019 | 16:15 |
| Tifilefetcher.exe | 6.2.9200.23060 | 380,928 | 15-May-2020 | 04:38 |
| Timezoneai.dll | 6.2.9200.21193 | 67,584 | 09-Aug-2014 | 06:36 |
| Tiworker.exe | 6.2.9200.21193 | 186,880 | 09-Aug-2014 | 06:37 |
| Wcmtypes.xsd | Not applicable | 1,047 | 02-Jun-2012 | 14:54 |
| Wcp.dll | 6.2.9200.23084 | 2,187,776 | 11-Jun-2020 | 03:15 |
| Wdscore.dll | 6.2.9200.22865 | 225,792 | 17-Aug-2019 | 16:15 |
| Winsockai.dll | 6.2.9200.16384 | 64,512 | 26-Jul-2012 | 03:20 |
| Wrpint.dll | 6.2.9200.21193 | 48,640 | 09-Aug-2014 | 06:36 |
| Ws2_helper.dll | 6.2.9200.16384 | 48,128 | 26-Jul-2012 | 03:20 |
For information on SSUs, see the following articles:
Learn about the terminology that Microsoft uses to describe software updates.
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