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Public proof of conceptFix available

CVE-2018-10920

A public proof of concept exists; no exploitation attested.

  • Published2018-08-02
  • Fixed in2.4.1
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Timeline

dates in UTC
  1. 2018-08-0213:29CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Versions per branch

NVD
Nic knot resolver
BranchAffectedFixed in
2.4< 2.4.12.4.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • knot-resolverUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • knot-resolverUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • knot-resolverDebian:14all versions · fixed in 2.4.1-1
  • knot-resolverDebian:13all versions · fixed in 2.4.1-1
  • knot-resolverDebian:12all versions · fixed in 2.4.1-1

Full record on NVD

Fix

  1. Update Nic knot resolver to 2.4.1

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.16.8read 2026-10-23
  • CNACVSS 3.07.5known since 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-20known since 2026-10-23
  • NVDweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score3.2 %2026-11-08
  • PoC-in-GitHubproof of concept1known since 2026-11-01
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Published
2018-08-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-xv4h-w5rx-q9c8

Frequently asked questions

What is CVE-2018-10920?

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Is CVE-2018-10920 actively exploited?

Active exploitation of CVE-2018-10920 has not been confirmed. Its EPSS score was 3.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-10920?

CVE-2018-10920 has a CVSS v3 base score of 6.8 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N.

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