What’s Vulnerable › Vulnerabilities

CVE-2019-10190

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-07-16 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Fedoraproject Fedora: 29, 30
• CZ.NIC knot-resolver: through 3.2.0; from 4.0.0 before 4.1.0 — fixed in 4.1.0

How to fix

Upgrade to a fixed version: CZ.NIC knot-resolver 4.1.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10190
• https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMSSWBHINIX4WE6UDXWM66L7JYEK6XS6/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZV5YZZ5766UIG2TFLFJL6EESQNAP5X5/
• https://www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10190
• https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMSSWBHINIX4WE6UDXWM66L7JYEK6XS6/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZV5YZZ5766UIG2TFLFJL6EESQNAP5X5/
• https://www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html

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