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Vulnerability record · CVE-2019-10190 · published 16 July 2019

CVE-2019-10190: Nic knot resolver improper input validation vulnerability

Nic · Knot Resolver

A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. Caching is not affected by this particular bug but see CVE-2019-10191.

7.5 CVSS 3.1 High EPSS 2.0% · top 20.0% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. Caching is not affected by this particular bug but see CVE-2019-10191.

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

Affected products

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

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10190 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMSSWBHINIX4WE6UDXWM66L
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZV5YZZ5766UIG2TFLFJL6E
https://www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html Release NotesVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10190 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMSSWBHINIX4WE6UDXWM66L
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZV5YZZ5766UIG2TFLFJL6E
https://www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html Release NotesVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-10190), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.