CVE-2006-4252: Powerdns Recursor

Medium severity, CVSS 5.0. EPSS: 6% chance of exploitation in the next 30 days.

PowerDNS Recursor 3.1.3 and earlier allows remote attackers to cause a denial of service (resource exhaustion and application crash) via a CNAME record with a zero TTL, which triggers an infinite loop.

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.