The TIFFSetProfiles function in coders/tiff.c in ImageMagick 7.0.6 has incorrect expectations about whether LibTIFF TIFFGetField return values imply that data validation has occurred, which allows remote attackers to cause a denial of service (use-after-free after an invalid call to TIFFSetField, and application crash) via a crafted file.
https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=32560
https://lists.debian.org/debian-lts-announce/2021/01/msg00010.html