Does .NET Framework 4.5.1 Include Hotfix 2848798?

My ASP.NET 4.5 web site is generating the following exception intermittently:

System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.TypeInitializationException: The type initializer for 'System.Net.WebUtility' threw an exception. ---> System.Web.HttpException

The site is running on Windows 2008 R2 with SP1 64 bit.

This appears to be a known issue with .NET 4.5 and is addressed in a hot fix.  See:http://support.microsoft.com/kb/2848798/en-us , section: ASP.NET issue 1.

Has a fix for this issue been included in the RTM release of .NET Framework 4.5.1?