In PowerDNS Recursor versions up to and including 4.3.1, 4.2.2 and 4.1.16, the ACL restricting access to the internal web server is not properly enforced.
lists.opensuse.org/opensuse-security-announce/2020-07/msg00043.html
lists.opensuse.org/opensuse-security-announce/2020-09/msg00042.html
lists.opensuse.org/opensuse-security-announce/2020-09/msg00044.html
lists.opensuse.org/opensuse-security-announce/2020-10/msg00036.html
doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-04.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7TUNCUZNASYSTVD35QGFAI6XO2BFMQ2F/
www.openwall.com/lists/oss-security/2020/07/01/1