Cumulative security update for Internet Explorer: May 9, 2017

Summary

This security update resolves several reported vulnerabilities in Internet Explorer. The most severe of these vulnerabilities could allow remote code execution if a user views a specially crafted webpage in Internet Explorer. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures. Additionally, see the following articles for more information about this cumulative update:

• Windows 7 SP1 and Windows Server 2008 R2 SP1 update history

• Windows Server 2012 update history

• Windows 8.1 and Windows Server 2012 R2 update history

• Windows 10 and Windows Server 2016 update history
  Important

• The fixes included in this Security Update for Internet Explorer 4018271 are also included in the May 2017 Security Monthly Quality Rollup. Installing either the Security Update for Internet Explorer or the Security Monthly Quality Rollup installs the fixes that are resolved in this update.

• If you use update management processes other than Windows Update, and you automatically approve all security updates classifications for deployment, this Security Update for Internet Explorer 4018271, the May 2017 Security Only Quality Update, and the May 2017 Security Monthly Quality Rollup are deployed. We recommend that you review your update deployment rules to make sure the desired updates are deployed.

• This Security Update for Internet Explorer is not applicable for installation on a computer where the Security Monthly Quality Rollup or the Preview of Monthly Quality Rollup from May 2017 (or a later month) is already installed. This is because those updates contain all fixes in this Security Update for Internet Explorer.
  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.

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

How to get and install the update

Method 1: Microsoft Update

This update is available through 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.

Note For Windows RT and Windows RT 8.1, this update is available through Microsoft Update only.

Method 2: Microsoft Update Catalog

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

More Information

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How to get help and support for this security update

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 informationFor a list of the files that are provided in this cumulative update, download the file information for cumulative update 4018271.

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File hash information

File name	SHA1 hash	SHA256 hash
Windows8.1-KB4018271-x86.msu	9471B6EC61AFFFF81FF75591A8CDFF42F088DED2	96833D33DE2A617416C3C81DAE8B9A93C73052418E41FBA3182E54850D836F3D
Windows8.1-KB4018271-x64.msu	73D231B6564968233D4E55D9B6B14077A3041AEF	C229DF805CE8B6F6A6A9FC2F839498C8665065284349AC5193F3F0C079AE17E3
IE11-Windows6.1-KB4018271-X64.msu	7C8D8BEB9999D65C8DB17001C697E82A9A0BB1D1	E899AE1A2FBD41D2D5A0B3005BA2E6CB39795F47F64857F5F5C283B41DCA6476
IE11-Windows6.1-KB4018271-X86.msu	3EB0C93394FCA87F3DE52AE200A57E1770E741D6	63178E14811DEE09174D996FCC7859E25C6C1B43957A8DCB8621F78CF2B69B89