Italian security researcher Luigi Auriemma discovered two vulnerabilities in all current versions of Samsung TVs and Blu-Ray systems that could allow an attacker to gain remote access to those devices. One of the bugs leads to a loop of endless restarts while the other could cause a potential buffer overflow. To exploit the vulnerabilities requires only that the devices are connected to a wi-fi network. He claims there is no fix for these bugs because he was unable to report the bugs to Samsung. He has also received no word from Samsung.
Source: https://threatpost.com/researcher-causes-endless-restart-loop-samsung-tvs-042412/76468/