Resolves a vulnerability in Windows that could allow remote code execution if an attacker runs a specially crafted application that connects to an iSNS Server and then issues malicious requests to the server.

Summary

This security update resolves vulnerabilities in Microsoft Windows. The most severe of the vulnerabilities could allow remote code execution if an attacker runs a specially crafted application that connects to an iSNS Server and then issues malicious requests to the server.

To learn more about the vulnerability, see Microsoft Security Bulletin MS17-012.

More Information

Important

All future security and non-security updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows RT 8.1-based, Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive future updates.
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.

Additional information about this security update

The following articles contain more information about this security update as it relates to individual product versions. These articles may contain known-issue information.

4012021 MS17-012: Description of the security update for Microsoft Windows: March 14, 2017
3217587 MS17-012: Description of the security update for Microsoft Windows: March 14, 2017
4012216 March 2017 Security Monthly Quality Rollup for Windows 8.1 and Windows Server 2012 R2
4012213 March 2017 Security Only Quality Update for Windows 8.1 and Windows Server 2012 R2
4012217 March 2017 Security Monthly Quality Rollup for Windows Server 2012
4012214 March 2017 Security Only Quality Update for Windows Server 2012
4012215 March 2017 Security Monthly Quality Rollup for Windows 7 SP1 and Windows Server 2008 R2 SP1
4012212 March 2017 Security Only Quality Update for Windows 7 SP1 and Windows Server 2008 R2 SP1
4013429 March 13, 2017—KB4013429 (OS Build 933)
4012606 March 14, 2017—KB4012606 (OS Build 17312)
4013198 March 14, 2017—KB4013198 (OS Build 830)

Security update deployment

Windows Vista (all editions)

Reference table

The following table contains the security update information for this software.

Security update file names	For all supported 32-bit editions of Windows Vista: Windows6.0-KB3217587-x86.msu
	For all supported x64-based editions of Windows Vista: Windows6.0-KB3217587-x64.msu
Installation switches	See Microsoft Knowledge Base article 934307
Restart requirement	A system restart is required after you apply this security update.
Removal information	WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under "Windows Update," click View installed updates, and then select from the list of updates.
File information	See Microsoft Knowledge Base article 3217587
Registry key verification	Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 (all editions)

Reference table

The following table contains the security update information for this software.

Security update file names	For all supported 32-bit editions of Windows Server 2008: Windows6.0-KB3217587-x86.msu Windows6.0-KB4012021-x86.msu
	For all supported x64-based editions of Windows Server 2008: Windows6.0-KB3217587-x64.msu Windows6.0-KB4012021-x64.msu
	For all supported Itanium-based editions of Windows Server 2008 Windows6.0-KB3217587-ia64.msu
Installation switches	See Microsoft Knowledge Base article 934307
Restart requirement	A system restart is required after you apply this security update.
Removal information	WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under "Windows Update," click View installed updates and select from the list of updates.
File information	See Microsoft Knowledge Base article 3217587 See Microsoft Knowledge Base article 4012021
Registry key verification	Note A registry key does not exist to validate the presence of this update.

More Information

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

CVE-2017-00016