ImageMagick 7.0.7-1 and older version are vulnerable to null pointer dereference in the MagickCore component and might lead to denial of service
https://github.com/ImageMagick/ImageMagick/issues/775
https://lists.debian.org/debian-lts-announce/2018/01/msg00002.html
https://lists.debian.org/debian-lts-announce/2019/05/msg00015.html
https://lists.debian.org/debian-lts-announce/2020/09/msg00007.html