CVE-2009-4009

CVE-2009-4009 is a critical-severity vulnerability in Powerdns Recursor with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 18% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Description

Buffer overflow in PowerDNS Recursor before 3.1.7.2 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via crafted packets.

Frequently asked questions

What is CVE-2009-4009?
Buffer overflow in PowerDNS Recursor before 3.1.7.2 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via crafted packets.
How severe is CVE-2009-4009?
CVE-2009-4009 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-4009 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4009?
CVE-2009-4009 primarily affects Powerdns Recursor. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4009?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-4009 published?
CVE-2009-4009 was published on 2010-01-08 and last updated on 2026-06-16.

References

Affected products (18)

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