The following file is available for download from the Microsoft Download Center:Download the package now.
Release Date: April 12, 2011
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
How to obtain Microsoft support files from online services
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To install this update, you must have Windows Installer 3.1 or a later version installed on the computer. To obtain the latest version of Windows Installer, visit the following Microsoft website:
Known issues and additional information about this security update
For more information about installation issues with the Microsoft .NET Framework 4.0, click the following article number to view the article in the Microsoft Knowledge Base:
Updates for the .NET Framework may not have a fully localized setup experience2431208
An update for the Microsoft .NET Framework may fail to install when the Microsoft .NET Framework 4 is installed and a restart is pending2260913
Files in use or File Locks can Result in Framework Assembly Files being Deleted2263996
Patching of Microsoft Framework can fail with Access is denied or File in Use error 2570538
Installing updates for the Microsoft .NET Framework 4 can take longer than expected in some scenarios
Command-line switches for this update
For information about the various command-line switches that are supported by this update, see the Windows Installer command-line switches
For more information about Windows Installer, visit the Windows Installer MSDN website
This update does not require a system restart after you apply it unless files being updated are locked or in use. However, installing this update will trigger a restart of all Internet Information Services (IIS)-related services, including the IISADMIN, W3SVC, FTP, and SMTP services. This behavior occurs because a base component for the .NET Framework includes instructions for restarting these services. Therefore, every update to the product will execute the same restarting instructions.
Update removal information
To remove this update, use the Add or Remove Programs
item in Control Panel.
Update replacement information
The x64 and Itanium based versions of this security update replace the following security update:
MS10-077: Vulnerability in the .NET Framework could allow remote code execution
update security_patch security_update security bug flaw vulnerability malicious attacker exploit registry unauthenticated buffer overrun overflow specially-formed scope specially-crafted denial of service DoS TSE