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Vulnerability record · CVE-2019-10191 · published 16 July 2019

CVE-2019-10191: Nic knot resolver improper input validation vulnerability

Nic · Knot Resolver

A vulnerability was discovered in DNS resolver of knot resolver before version 4.1.0 which allows remote attackers to downgrade DNSSEC-secure domains to DNSSEC-insecure state, opening possibility of domain hijack using attacks against insecure DNS protocol.

7.5 CVSS 3.1 High EPSS 1.9% · top 20.7% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
1.9%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 of knot resolver before version 4.1.0 which allows remote attackers to downgrade DNSSEC-secure domains to DNSSEC-insecure state, opening possibility of domain hijack using attacks against insecure DNS protocol.

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-2019-10191 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-2019-10191 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-2019-10191), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.