How severe is CVE-2009-4022?

CVE-2009-4022 has a CVSS 2.0 base score of 2.6, rated low severity.

Is CVE-2009-4022 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-2009-4022?

CVE-2009-4022 primarily affects Isc Bind. In total, 169 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4022?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-4022 published?

CVE-2009-4022 was published on 2009-11-25 and last updated on 2026-06-16.

CVE-2009-4022

CVE-2009-4022 is a low-severity vulnerability in Isc Bind with a CVSS 2.0 base score of 2.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 2.0 base score 2.6)
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Isc Bind
Published: 2009-11-25
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2009-4022?: 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 severe is CVE-2009-4022?: CVE-2009-4022 has a CVSS 2.0 base score of 2.6, rated low severity.
Is CVE-2009-4022 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-2009-4022?: CVE-2009-4022 primarily affects Isc Bind. In total, 169 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4022?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4022 published?: CVE-2009-4022 was published on 2009-11-25 and last updated on 2026-06-16.

References

Affected products (169)

cpe:2.3:a:isc:bind:9.0:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.0:rc4:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.0:rc5:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.0:rc6:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.1:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.1:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.0.1:rc2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.0:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.1:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.1:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.1:rc2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.1:rc3:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.1:rc4:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.1:rc5:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.1:rc6:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.1:rc7:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.2:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.2:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.3:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.3:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.3:rc2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.1.3:rc3:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:a1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:a2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:a3:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:b1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:b2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:rc10:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:rc2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:rc3:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:rc4:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:rc5:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.2.0:rc6:*:*:*:*:*:*

More vulnerabilities in Isc Bind

CVE-2008-0122 — Critical (CVSS 10.0): Off-by-one error in the inet_network function in libbind in ISC BIND 9.4.2 and earlier, as used in libc in FreeBSD 6.2…
CVE-2001-0011 — Critical (CVSS 10.0): Buffer overflow in nslookupComplain function in BIND 4 allows remote attackers to gain root privileges.
CVE-2001-0013 — Critical (CVSS 10.0): Format string vulnerability in nslookupComplain function in BIND 4 allows remote attackers to gain root privileges.
CVE-2001-0010 — Critical (CVSS 10.0): Buffer overflow in transaction signature (TSIG) handling code in BIND 8 allows remote attackers to gain root privileges.
CVE-2000-1029 — Critical (CVSS 10.0): Buffer overflow in host command allows a remote attacker to execute arbitrary commands via a long response to an AXFR…
CVE-1999-0837 — Critical (CVSS 10.0): Denial of service in BIND by improperly closing TCP sessions via so_linger.

All CVEs affecting Isc Bind →