PowerDNS Recursor versions 3.1.7.1 and below suffer from two vulnerabilities that allow for full system compromise.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/84854/powerdns-pwn.txt
Source: https://packetstormsecurity.com/files/84854/PowerDNS-Recursor-Full-System-Compromise.html