How severe is CVE-2008-4126?

CVE-2008-4126 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-2008-4126 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-4126?

CVE-2008-4126 primarily affects Debian Python-dns. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-4126?

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

When was CVE-2008-4126 published?

CVE-2008-4126 was published on 2008-09-18 and last updated on 2026-06-16.

CVE-2008-4126

CVE-2008-4126 is a medium-severity vulnerability in Debian Python-dns with a CVSS 2.0 base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-16.

Key facts

Severity: Medium (CVSS 2.0 base score 6.4)
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-16
Affected product: Debian Python-dns
Published: 2008-09-18
Last modified: 2026-06-16

Description

PyDNS (aka python-dns) before 2.3.1-5 in Debian GNU/Linux does not use random source ports for DNS requests and does not use random transaction IDs for DNS retries, which makes it easier for remote attackers to spoof DNS responses, a different vulnerability than CVE-2008-1447. NOTE: this vulnerability exists because of an incomplete fix for CVE-2008-4099.

Frequently asked questions

What is CVE-2008-4126?: PyDNS (aka python-dns) before 2.3.1-5 in Debian GNU/Linux does not use random source ports for DNS requests and does not use random transaction IDs for DNS retries, which makes it easier for remote attackers to spoof DNS responses, a different vulnerability than CVE-2008-1447. NOTE: this vulnerability exists because of an incomplete fix for CVE-2008-4099.
How severe is CVE-2008-4126?: CVE-2008-4126 has a CVSS 2.0 base score of 6.4, rated medium severity.
Is CVE-2008-4126 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-4126?: CVE-2008-4126 primarily affects Debian Python-dns. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-4126?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-4126 published?: CVE-2008-4126 was published on 2008-09-18 and last updated on 2026-06-16.

References

Affected products (11)

cpe:2.3:a:debian:python-dns:*:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.0-1:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.0-2:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.0-3:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.0-4:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.0-5:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.0-5.1:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.0-6:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.1-1:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.1-2:*:*:*:*:*:*:*
cpe:2.3:a:debian:python-dns:2.3.1-3:*:*:*:*:*:*:*

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