AT&T has started pushing out a new update to Samsung's Galaxy S series flagship smartphones from last year. The update - arriving as version G930AUCS4BQJ2 for the S7 and G935AUCS4BQJ2 for the S7 edge - includes October security patch. In addition to the latest security fixes, the update also brings along fix for the BlueBorne vulnerability, which allows a remote attacker to take control of devices via Bluetooth, even if they're not set in discoverable mode. The rollout stated late last week, so it shouldn't be long before you get to a notification for the 135MB update on your device...
Source: https://www.gsmarena.com/samsung_galaxy_s7_s7_edge_on_at_t_getting_new_update-news-27985.php