 In November 2012 , The FreeBSD Security Team announced that hackers gained unauthorized access on two of the project 's servers . These servers were turned off immediately . More research demonstrated that the first unauthorized access by hackers occurred on 19 September . Apparently hackers gained access to these servers by stealing SSH keys from one of the developers , not by exploiting a bug in the operating system itself . These two hacked servers were part of the infrastructure used to build third @-@ party software packages . The FreeBSD Security Team checked the integrity of the binary packages and announced that no unauthorized change was made to the binary packages , but they stated that they can 't guarantee the integrity of packages that were downloaded between 19 September and 11 November . 
