CVE-2023-46317: Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from s

Q: How do I fix CVE-2023-46317?

knot resolver: upgrade to 5.7.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-46317 being exploited?

CVE-2023-46317 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-2023-46317 affect?

CVE-2023-46317 affects knot resolver. Severity is high (CVSS 7.5). Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers.

Q: How urgent is CVE-2023-46317?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2023-46317 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.

Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers.

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	0.8% (top 45%)
CISA exploited list	No
Published	2023-10-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nic

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

Am I affected?

Timeline

2023-10-22 23:15 UTCPublished CVE record published
2026-06-17 06:30 UTCUpdated Record last modified

nic knot resolver UPGRADE

Affected: < 5.7.0

Fixed in: 5.7.0

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 5.7.0 (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-2023-46317?

knot resolver: upgrade to 5.7.0. Exact commands for each OS are on this page.

Is CVE-2023-46317 being exploited?

CVE-2023-46317 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-2023-46317 affect?

CVE-2023-46317 affects knot resolver. Severity is high (CVSS 7.5). Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers.

How urgent is CVE-2023-46317?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

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
CVE-2020-12667 HIGH 7.5 UPGRADE Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled s

References

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