I don't disagree with ETA. However, when the IRS gets a late return, their first correspondence is often "your form is late and based on the # of days the penalty is $15k." That letter also contains information on how to go through the DFVC with a small user fee rather than the 15k. In this case, the return was filed on an EZ so they obvously would not include the DFVC info, and based on the year (2013) Im not sure if its eligible for the EZ program.
In any event, it should be taken seriously and requires immediate attention.