CVE-2006-4251 Memory corruption in n/a
Remote attackers can execute arbitrary code via malformed TCP DNS queries due to a buffer overflow in PowerDNS Recursor.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2006-4251?
CVE-2006-4251 is a high-severity memory corruption 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
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.
Which versions are affected by CVE-2006-4251?
It affects 1 product.
Products include Powerdns Recursor.
How do I fix CVE-2006-4251?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2006-4251 being exploited?
There is no known exploitation of CVE-2006-4251 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-2006-4251, DSA-1211-1, GHSA-xh75-hw4q-gr36.