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McAfee Web Gateway (AV): The 7423 DATs (release date April 29, 2014) provide coverage.
Microsoft also issued an important out-of-band patch for all versions of IE via Windows Update which should be installed without delay.
If I may add, As Ex_Brit stipulated. It is imperative that the "Out of Band" patch be applied ASAP.
However to prevent possible issues, please "View" your update history for the last "Update Tuesday"-4/8/2014.
Confirm that you indeed have the (KB2929437) installed before proceeding. It is explained in entirety http://support.microsoft.com/kb/2964358
Edited to repair "Broken Link"