CVE-2006-4251: Powerdns Recursor

High severity, CVSS 7.5. EPSS: 8.5% chance of exploitation in the next 30 days.

Buffer overflow in PowerDNS Recursor 3.1.3 and earlier might allow remote attackers to execute arbitrary code via a malformed TCP DNS query that prevents Recursor from properly calculating the TCP DNS query length.

Affected products

• Powerdns Recursor: up to and including 3.1.3; version 2.0_rc1 only; version 2.8 only; version 2.9.15 only; version 2.9.16 only; version 2.9.17 only; …

Published 2006-11-14. Last modified 2026-06-16.