When PHP EXIF extension is parsing EXIF information from an image, e.g. via exif_read_data() function, in PHP versions 7.1.x below 7.1.31, 7.2.x below 7.2.21 and 7.3.x below 7.3.8 it is possible to supply it with data what will cause it to read past the allocated buffer. This may lead to information disclosure or crash.
lists.opensuse.org/opensuse-security-announce/2019-10/msg00019.html
seclists.org/fulldisclosure/2019/Oct/15
seclists.org/fulldisclosure/2019/Oct/55
access.redhat.com/errata/RHSA-2019:3299
bugs.php.net/bug.php?id=78256
lists.debian.org/debian-lts-announce/2019/08/msg00010.html
seclists.org/bugtraq/2019/Oct/9
seclists.org/bugtraq/2019/Sep/35
seclists.org/bugtraq/2019/Sep/38
security.netapp.com/advisory/ntap-20190822-0003/
support.apple.com/kb/HT210634
support.apple.com/kb/HT210722
usn.ubuntu.com/4097-1/
usn.ubuntu.com/4097-2/
www.debian.org/security/2019/dsa-4527
www.debian.org/security/2019/dsa-4529
www.tenable.com/security/tns-2021-14