Porter pleaded guilty to 25 counts of indecent assault and gross indecency on young boys.
The Court of Appeal will now review the case to decide whether to increase Porter's sentence.
A statement from the Attorney General's office said: "After a careful review, the Attorney General Baroness Scotland has decided to refer the sentence.
"She considers the sentence to be unduly lenient.
"It will now be for the Court of Appeal to decide at a future hearing whether or not to increase the sentence."
Judge Tom Crowther opted not to jail the self-confessed paedophile after hearing he had undergone therapy.
Dan Norris, Labour MP for Wansdyke, Somerset, and a former child protection officer, welcomed the Attorney General's decision.
"A relieved public will greatly welcome this common sense decision to review this wicked abuser's sentence," he said.
