CVE-2018-10920
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceImproper input validation in Knot Resolver's DNS resolver component before version 2.4.1 allows remote attackers to inject malicious DNS records into the resolver's cache, potentially redirecting legitimate DNS queries to attacker-controlled infrastructure.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 2.4.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Knot Resolver installationCheck if knot-resolver package is installed. On Linux systems, run: `dpkg -l knot-resolver` or `rpm -qa | grep knot-resolver` or check for the kresd service: `systemctl list-units | grep kresd`Affected if Knot Resolver package or service is found on the system
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Identify installed versionRun `knot-resolver --version` or check the package version: `dpkg -s knot-resolver | grep Version` or `rpm -qi knot-resolver`Affected if Installed version is lower than 2.4.1 (for example, 2.4.0, 2.3.x, etc.)
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Verify DNS resolver component is activeCheck if the kresd daemon is running: `systemctl status kresd` or `ps aux | grep kresd`. Also check configuration directory /etc/knot-resolver/ for active configuration files.Affected if The kresd service is running and the DNS resolver component is actively processing queries
The environment is affected if Knot Resolver (kresd) is installed with a version lower than 2.4.1 and the DNS resolver service is active.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data2.4.1
Upgrade Knot Resolver to version 2.4.1 or later to remediate the input validation flaw; consider implementing DNSSEC validation as an additional defense layer against cache poisoning attacks.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-10920 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2018-10920 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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