An issue was discovered in Dual DHCP DNS Server 7.40. Due to insufficient access restrictions in the default installation directory, an attacker can elevate privileges by replacing the DualServer.exe binary.
https://sourceforge.net/projects/dhcp-dns-server/
https://github.com/an0ry/advisories
https://github.com/OffensiveOceloot/advisories/blob/main/CVE-2020-26133.md