There are two major vulnerabilities which were recently discovered in the PowerDNS Recursor (all versions up to and including 3.1.7.1) which can lead to a full system compromise and/or cache poisoning.
These vulnerabilities were addressed and resulted in the PowerDNS Reucursor 3.1.7.2 release. All PowerDNS Recursor Users are urged to upgrade as soon as possible.
Versions of PowerDNS Authorative Server are not affected.