Is CVE-2009-4022 in the CISA KEV catalog?

No. CVE-2009-4022 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-4022?

CVE-2009-4022 has a CVSS v2 base score of 2.6 (LOW).

What is the EPSS score for CVE-2009-4022?

CVE-2009-4022 has an EPSS score of 7.95% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-4022?

Upgrade bind9 on debian 11 to 1:9.6.1.dfsg.P2-1 or later.

CVE & CISA-KEV Catalog

CVE-2009-4022

LOWEPSS 94th pctl

2.6

CVSS v2

NVD

Description

Unspecified vulnerability in ISC BIND 9.0.x through 9.3.x, 9.4 before 9.4.3-P4, 9.5 before 9.5.2-P1, 9.6 before 9.6.1-P2, and 9.7 beta before 9.7.0b3, with DNSSEC validation enabled and checking disabled (CD), allows remote attackers to conduct DNS cache poisoning attacks by receiving a recursive client query and sending a response that contains an Additional section with crafted data, which is not properly handled when the response is processed "at the same time as requesting DNSSEC records (DO)," aka Bug 20438.

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.6.1.dfsg.P2-1CVE-2009-4022

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

7.95%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.