In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it is possible to cause FPM module to write past allocated buffers into the space reserved for FCGI protocol data, thus opening the possibility of remote code execution.
https://github.com/neex/phuip-fpizdam
https://bugs.php.net/bug.php?id=78599
https://usn.ubuntu.com/4166-1/
https://usn.ubuntu.com/4166-2/
https://www.debian.org/security/2019/dsa-4553
https://www.debian.org/security/2019/dsa-4552
https://support.f5.com/csp/article/K75408500?utm_source=f5support&utm_medium=RSS
https://security.netapp.com/advisory/ntap-20191031-0003/
https://access.redhat.com/errata/RHSA-2019:3287
https://access.redhat.com/errata/RHSA-2019:3286
https://access.redhat.com/errata/RHSA-2019:3299
https://access.redhat.com/errata/RHSA-2019:3300
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00011.html
https://access.redhat.com/errata/RHSA-2019:3724
https://access.redhat.com/errata/RHSA-2019:3735
https://access.redhat.com/errata/RHSA-2019:3736
https://www.synology.com/security/advisory/Synology_SA_19_36
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00014.html
https://support.apple.com/kb/HT210919
https://seclists.org/bugtraq/2020/Jan/44
http://seclists.org/fulldisclosure/2020/Jan/40
https://access.redhat.com/errata/RHSA-2020:0322
http://packetstormsecurity.com/files/156642/PHP-FPM-7.x-Remote-Code-Execution.html
Source: MITRE
Published: 2019-10-28
Updated: 2021-07-22
Type: CWE-787
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL