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Vulnerability record · CVE-2020-25829 · published 16 October 2020

CVE-2020-25829: Powerdns recursor vulnerability

Powerdns · Recursor

An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5. A remote attacker can cause the cached records for a given name to be updated to the Bogus DNSSEC validation state, instead of their actual DNSSEC Secure state, via a DNS ANY query. This results in a denial of service for installation that always validate (dnssec=validate), and for clients requesting validation when on-demand validation is enabled (dnssec=process).

7.5 CVSS 3.1 High EPSS 6.5% · top 6.4%
7.5CVSS 3.1 base score, v2 5.0
6.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5. A remote attacker can cause the cached records for a given name to be updated to the Bogus DNSSEC validation state, instead of their actual DNSSEC Secure state, via a DNS ANY query. This results in a denial of service for installation that always validate (dnssec=validate), and for clients requesting validation when on-demand validation is enabled (dnssec=process).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00036.html Third Party Advisory
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-07.html Vendor Advisory
https://security.gentoo.org/glsa/202012-19 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00036.html Third Party Advisory
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-07.html Vendor Advisory
https://security.gentoo.org/glsa/202012-19 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-25829), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.