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Vulnerability record · CVE-2018-1110 · published 30 March 2021

CVE-2018-1110: Nic knot resolver improper input validation vulnerability

Nic · Knot Resolver

A flaw was found in knot-resolver before version 2.3.0. Malformed DNS messages may cause denial of service.

7.5 CVSS 3.1 High EPSS 1.1% · top 35.3% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

A flaw was found in knot-resolver before version 2.3.0. Malformed DNS messages may cause denial of service.

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

Affected products

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

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1944328 Issue TrackingThird Party Advisory
https://www.knot-resolver.cz/2018-04-23-knot-resolver-2.3.0.html Release NotesVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1944328 Issue TrackingThird Party Advisory
https://www.knot-resolver.cz/2018-04-23-knot-resolver-2.3.0.html Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2023-50387DNSSEC KeyTrap flaw in DNS resolvers causes CPU exhaustion DoSCVE-2023-50387, known as KeyTrap, is a flaw in DNSSEC validation logic where a zone containing many DNSKEY and RRSIG records forces resolvers to eval…EPSS 100%analysed7.5CVE-2023-46317Nic knot resolver vulnerabilityKnot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers.EPSS 0.64%7.5CVE-2023-26249Nic knot resolver allocation without limits vulnerabilityKnot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. S…EPSS 0.71%7.5CVE-2022-40188Nic knot resolver vulnerabilityKnot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of algorithmic complexity. During an attack…EPSS 1.9%7.5CVE-2021-40083Nic knot resolver vulnerabilityKnot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case (NSEC3 with too many iterations used fo…EPSS 1.4%7.5CVE-2020-12667Nic knot resolver uncontrolled resource consumption vulnerabilityKnot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This …EPSS 2.5%7.5CVE-2019-19331Nic knot resolver improper resource shutdown vulnerabilityknot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might…EPSS 2.2%7.5CVE-2019-10190Nic knot resolver improper input validation vulnerabilityA 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 …EPSS 2.0%

Source: NIST National Vulnerability Database (record CVE-2018-1110), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.