An issue was discovered in adns before 1.5.2. It corrupts a pointer when a nameserver speaks first because of a wrong number of pointer dereferences. This bug may well be exploitable as a remote code execution.
www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git
www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blob;f=changelog
lists.fedoraproject.org/archives/list/[email protected]/message/TRVHN3GGVNQWAOL3PWC5FLAV7HUESLZR/
lists.fedoraproject.org/archives/list/[email protected]/message/UGFZ4SPV6KFQK6ZNUZFB5Y32OYFOM5YJ/
www.chiark.greenend.org.uk/pipermail/adns-announce/2020/000004.html