options.c in atftp before 0.7.5 reads past the end of an array, and consequently discloses server-side /etc/group data to a remote client.
https://sourceforge.net/p/atftp/code/ci/9cf799c40738722001552618518279e9f0ef62e5
https://lists.debian.org/debian-lts-announce/2022/05/msg00040.html