CVE-2006-4252 Denial of service in n/a
Remote attackers can cause a denial of service in PowerDNS Recursor via a CNAME record with zero TTL, triggering an infinite loop.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2006-4252?
CVE-2006-4252 is a medium-severity denial of service vulnerability in Powerdns Recursor, published on 14 Nov 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2006-4252?
It affects 1 product.
Products include Powerdns Recursor.
How do I fix CVE-2006-4252?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2006-4252 being exploited?
There is no known exploitation of CVE-2006-4252 in the wild and no public exploit code.
Other vulnerabilities in Powerdns Recursor
- CVE-2009-4009 Memory corruption in n/a
- CVE-2020-10030 Memory corruption in n/a
- CVE-2025-59023 Crafted delegations or IP fragments can poison cached delegations in Recursor
- CVE-2025-59030 Insufficient validation of incoming notifies over TCP can lead to a denial of service in Recursor
- CVE-2023-22617 Denial of service in n/a
Sources
Also known as DEBIAN-CVE-2006-4252, GHSA-mx38-c6fm-chc9.