April 11, 2014
According to a brief – if not terse – statement on the TSP website, the site itself was unaffected by ‘heartbleed’:
TSP Safe from “Heartbleed” Bug — (April 10, 2014) We have reviewed our systems. TSP.gov is not affected by the Heartbleed vulnerability.
While tsp.gov is not included, here is a list of major sites that were and were not affected by ‘heartbleed.’