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Vulnerability record · CVE-2019-3871 · published 21 March 2019

CVE-2019-3871: Powerdns authoritative server improper input validation vulnerability

Powerdns · Authoritative Server

A vulnerability was found in PowerDNS Authoritative Server before 4.0.7 and before 4.1.7. An insufficient validation of data coming from the user when building a HTTP request from a DNS query in the HTTP Connector of the Remote backend, allowing a remote user to cause a denial of service by making the server connect to an invalid endpoint, or possibly information disclosure by making the server connect to an internal endpoint and somehow extracting meaningful information about the response

8.8 CVSS 3.0 High EPSS 13% · top 3.9% CWE-20 · Improper input validation
8.8CVSS 3.0 base score, v2 6.5
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
20References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

A vulnerability was found in PowerDNS Authoritative Server before 4.0.7 and before 4.1.7. An insufficient validation of data coming from the user when building a HTTP request from a DNS query in the HTTP Connector of the Remote backend, allowing a remote user to cause a denial of service by making the server connect to an invalid endpoint, or possibly information disclosure by making the server connect to an internal endpoint and somehow extracting meaningful information about the response

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00022.html
http://www.openwall.com/lists/oss-security/2019/03/18/4 ExploitMailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/107491 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3871 ExploitIssue TrackingPatchThird Party Advisory
https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2019-03.html Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00039.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GWUHF6MRSQ3YO7UUISGLV7M
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ROFI6OTWF4GKONNSNEDUCW6
https://seclists.org/bugtraq/2019/Apr/8
https://www.debian.org/security/2019/dsa-4424
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00022.html
http://www.openwall.com/lists/oss-security/2019/03/18/4 ExploitMailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/107491 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3871 ExploitIssue TrackingPatchThird Party Advisory
https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2019-03.html Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00039.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GWUHF6MRSQ3YO7UUISGLV7M
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ROFI6OTWF4GKONNSNEDUCW6
https://seclists.org/bugtraq/2019/Apr/8
https://www.debian.org/security/2019/dsa-4424

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Source: NIST National Vulnerability Database (record CVE-2019-3871), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.