In PHP versions 7.2.x below 7.2.9, 7.3.x below 7.3.16 and 7.4.x below 7.4.4, while parsing EXIF data with exif_read_data() function, it is possible for malicious data to cause PHP to read one byte of uninitialized memory. This could potentially lead to information disclosure or crash.
https://www.tenable.com/security/tns-2021-14
https://www.oracle.com/security-alerts/cpujan2021.html
https://www.debian.org/security/2020/dsa-4719
https://www.debian.org/security/2020/dsa-4717
https://usn.ubuntu.com/4330-2/
https://usn.ubuntu.com/4330-1/
https://security.netapp.com/advisory/ntap-20200403-0001/
https://lists.debian.org/debian-lts-announce/2020/04/msg00021.html
https://bugs.php.net/bug.php?id=79282
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00025.html