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 2.0 Service Pack 2 and with the .NET Framework 3.5 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:
When you try to install an update for the .NET Framework 1.0, 1.1, 2.0, 3.0, or 3.5, you may receive Windows Update error code "0x643" or Windows Installer error code "1603"923101
Error message when you try to install a security update for the .NET Framework 2.0 on a computer that is running Windows Server 2003 x64 Edition: "Error 1324. The folder 'Program Files' contains an invalid character"2197146
Updates for the .NET Framework 3.5 Service Pack 1 and the .NET Framework 2.0 Service Pack 2 may cause the Microsoft Knowledge Base article number to appear instead of the full title of the update in the Add or Remove Programs item in Control Panel2260913
FIX: Updating the .NET Framework may fail and some files in the GAC may be deleted 2263996
Patching of Microsoft Framework can fail with Access is denied or File in Use error
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 the files that are being updated are locked or in use. However, installing this update triggers a restart of all Internet Information Services (IIS)-related services, and this includes 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
This security update replaces the following updates:
MS10-060: Description of the security update for the .NET Framework 3.5 Service Pack 1 and .NET Framework 2.0 Service Pack 2 on Windows Server 2003 and Windows XP: August 10, 2010974417
MS09-061: Description of the security update for the Microsoft .NET Framework 2.0 Service Pack 2 and the Microsoft .NET Framework 3.5 Service Pack 1: October 13, 2009
.NET Framework 3.5.1 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