Heap-based buffer overflow in the DHCP client (udhcpc) in BusyBox before 1.25.0 allows remote attackers to have unspecified impact via vectors involving OPTION_6RD parsing.
https://usn.ubuntu.com/3935-1/
https://security.gentoo.org/glsa/201612-04
https://lists.debian.org/debian-lts-announce/2021/02/msg00020.html
https://lists.debian.org/debian-lts-announce/2018/07/msg00037.html
https://git.busybox.net/busybox/commit/?id=352f79acbd759c14399e39baef21fc4ffe180ac2