CVE-2016-7069: Powerdns Dnsdist

High severity, CVSS 7.5. EPSS: 4.6% chance of exploitation in the next 30 days.

An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend. When dnsdist is configured to add EDNS Client Subnet to a query, the response may contain an EDNS0 OPT record that has to be removed before forwarding the response to the initial client. On a 32-bit system, the pointer arithmetic used when parsing the received response to remove that record might trigger an undefined behavior leading to a crash.

Affected products

• Powerdns Dnsdist: up to and including 1.2.0

Published 2018-09-11. Last modified 2026-06-17.