CVE-2006-4251

CVE-2006-4251 is a high-severity vulnerability in Powerdns Recursor with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

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.

Frequently asked questions

What is CVE-2006-4251?
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.
How severe is CVE-2006-4251?
CVE-2006-4251 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2006-4251 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-4251?
CVE-2006-4251 primarily affects Powerdns Recursor. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-4251?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2006-4251 published?
CVE-2006-4251 was published on 2006-11-14 and last updated on 2026-06-16.

References

Affected products (12)

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