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Vulnerability record · CVE-2009-0858 · published 9 March 2009

CVE-2009-0858: D.j.bernstein djbdns improper input validation vulnerability

DD.J.Bernstein · Djbdns

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.

5.8 CVSS 2.0 Medium EPSS 6.3% · top 6.7% CWE-20 · Improper input validation
5.8CVSS 2.0 base score
6.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
22References, 2 tagged exploit
16 Jun 2026Last modified by NVD

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.

AV:N/AC:M/Au:N/C:N/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://it.slashdot.org/article.pl?sid=09/03/05/2014249
http://marc.info/?l=djbdns&m=123554945710038
http://marc.info/?l=djbdns&m=123613000920446&w=2
http://secunia.com/advisories/35820
http://securityandthe.net/2009/03/05/security-issue-in-djbdns-confirmed/ Patch
http://www.debian.org/security/2009/dsa-1831
http://www.securityfocus.com/archive/1/501294/100/0/threaded
http://www.securityfocus.com/archive/1/501340/100/0/threaded
http://www.securityfocus.com/archive/1/501479/100/0/threaded
http://www.securityfocus.com/bid/33937 Exploit
https://exchange.xforce.ibmcloud.com/vulnerabilities/49003
http://it.slashdot.org/article.pl?sid=09/03/05/2014249
http://marc.info/?l=djbdns&m=123554945710038
http://marc.info/?l=djbdns&m=123613000920446&w=2
http://secunia.com/advisories/35820
http://securityandthe.net/2009/03/05/security-issue-in-djbdns-confirmed/ Patch
http://www.debian.org/security/2009/dsa-1831
http://www.securityfocus.com/archive/1/501294/100/0/threaded
http://www.securityfocus.com/archive/1/501340/100/0/threaded
http://www.securityfocus.com/archive/1/501479/100/0/threaded
http://www.securityfocus.com/bid/33937 Exploit
https://exchange.xforce.ibmcloud.com/vulnerabilities/49003

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-0858), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.