There was an interesting talk by Ilja van Sprundel during 34C3 back in 2017 called "Are all BSDs created equally? - A survey of BSD kernel vulnerabilities" [1]

There was an interesting talk by Ilja van Sprundel during 34C3 back in 2017 called "Are all BSDs created equally? - A survey of BSD kernel vulnerabilities" [1] where a comparison is done between NetBSD/OpenBSD/FreeBSD. [1]: https://media.ccc.de/v/34c3-8968-are_all_bsds_created_equally https://media.ccc.de/v/34c3-8968-are_all_bsds_created_equall...