libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL.
https://www.oracle.com/security-alerts/cpuapr2022.html
https://usn.ubuntu.com/4447-1/
https://security.gentoo.org/glsa/202011-05
https://lists.debian.org/debian-lts-announce/2020/07/msg00034.html
https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120