Not really fishy. The 6.3.x series is the only version that is under active development [1] so quite naturally it follows that at least since 2013 (EOL of 6.2)

Not really fishy. The 6.3.x series is the only version that is under active development [1] so quite naturally it follows that at least since 2013 (EOL of 6.2) many users have upgraded to the supported version. A bit more disturbing IMHO is that you need an active support contract to even get the updates (based on information I got from Juniper customers, I couldn't find a direct confirmation on their site) meaning that aftermarket users are left in the cold. [1] https://www.juniper.net/support/eol/screenos.html https://www.juniper.net/support/eol/screenos.html