http://www.theregister.co.uk/2015/12/17/juniper_screen_os_contains_unauthorised_code/
on The Register's reading of the situation, the unauthorised code may have been present since 2008, an assertion we make because Juniper's notice about the problem says it impacts ScreenOS 6.2.0r15 through 6.2.0r18 and 6.3.0r12 through 6.3.0r20. ScreenOS 6.2 was released in 2008. Screen OS 6.3 came out in 2009.