CVE-2009-0858

CVE-2009-0858 is a medium-severity vulnerability in D.j.bernstein Djbdns with a CVSS 2.0 base score of 5.8. 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-20.

Key facts

Description

The response_addname function in response.c in Daniel J. Bernstein djbdns 1.05 and earlier does not constrain offsets in the required manner, which allows remote attackers, with control over a third-party subdomain served by tinydns and axfrdns, to trigger DNS responses containing arbitrary records via crafted zone data for this subdomain.

Frequently asked questions

What is CVE-2009-0858?
The response_addname function in response.c in Daniel J. Bernstein djbdns 1.05 and earlier does not constrain offsets in the required manner, which allows remote attackers, with control over a third-party subdomain served by tinydns and axfrdns, to trigger DNS responses containing arbitrary records via crafted zone data for this subdomain.
How severe is CVE-2009-0858?
CVE-2009-0858 has a CVSS 2.0 base score of 5.8, rated medium severity.
Is CVE-2009-0858 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0858?
CVE-2009-0858 affects D.j.bernstein Djbdns. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-0858?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0858 published?
CVE-2009-0858 was published on 2009-03-09 and last updated on 2026-06-16.

References

Affected products (1)

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