CVE-2018-1110: A flaw was found in knot-resolver before version 2.3.0

Q: How do I fix CVE-2018-1110?

knot resolver: upgrade to 2.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2018-1110 being exploited?

CVE-2018-1110 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1110 affect?

CVE-2018-1110 affects knot resolver. Severity is high (CVSS 7.5). A flaw was found in knot-resolver before version 2.3.0. Malformed DNS messages may cause denial of service.

Q: How urgent is CVE-2018-1110?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2018-1110 is a high-severity flaw (CVSS 7.5) affecting knot resolver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-20
Published	2021-03-30
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: nic

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-03-30 02:15 UTCPublished CVE record published
2026-06-17 01:50 UTCUpdated Record last modified

nic knot resolver UPGRADE

Affected: < 2.3.0

Fixed in: 2.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy knot-resolver || rpm -q knot-resolver || knot-resolver --version

2. UPGRADE to 2.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade knot-resolver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade knot-resolver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1110?

knot resolver: upgrade to 2.3.0. Exact commands for each OS are on this page.

Is CVE-2018-1110 being exploited?

CVE-2018-1110 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1110 affect?

CVE-2018-1110 affects knot resolver. Severity is high (CVSS 7.5). A flaw was found in knot-resolver before version 2.3.0. Malformed DNS messages may cause denial of service.

How urgent is CVE-2018-1110?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-46317 HIGH 7.5 UPGRADE Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from s
CVE-2023-26249 HIGH 7.5 UPGRADE Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and pot
CVE-2022-40188 HIGH 7.5 UPGRADE MITIGATE Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of a
CVE-2022-32983 MEDIUM 5.3 UPGRADE Knot Resolver through 5.5.1 may allow DNS cache poisoning when there is an attempt to limit forwarding actions
CVE-2021-40083 HIGH 7.5 UPGRADE Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case

References

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