CVE-2018-21216
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 · uneditedCertain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects D3600 before 1.0.0.67, D6000 before 1.0.0.67, D6100 before 1.0.0.56, and R6100 before 1.0.1.20.
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 confidenceMultiple NETGEAR router models (D3600, D6000, D6100, R6100) contain a buffer overflow vulnerability in their firmware that allows unauthenticated remote attackers to potentially execute arbitrary code or cause denial of service due to insufficient bounds checking in the affected code paths.
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< 1.0.1.20< 1.0.0.67< 1.0.0.67< 1.0.0.56CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Identify the router modelCheck the device label on the router or log into the web administration panel (typically at 192.168.1.1) to view the device model name displayed in the status or firmware sectionAffected if The model is not one of: D3600, D6000, D6100, or R6100 - if so, this CVE does not apply
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Locate the firmware versionIn the router web admin panel, navigate to the Firmware Update, Administration, or Status page to view the currently installed firmware version numberAffected if The firmware version cannot be determined or is not displayed
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Compare firmware version to affected rangesMatch your installed version against these thresholds: R6100 < 1.0.1.20, D6000 < 1.0.0.67, D3600 < 1.0.0.67, D6100 < 1.0.0.56Affected if Your installed version is lower than the threshold for your specific model - you are running a vulnerable version
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Check remote management exposureIn the router admin panel, examine the Remote Management, Access Control, or WAN Access settings to determine if the web interface is accessible from the WAN/internetAffected if Remote management is enabled and the router is directly exposed to untrusted networks, increasing exploitation risk
You are affected if your router is a D3600, D6000, D6100, or R6100 model running firmware versions below 1.0.0.67 (D3600/D6000), 1.0.0.56 (D6100), or 1.0.1.20 (R6100).
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 data1.0.0.561.0.0.671.0.1.20
Apply vendor-supplied firmware updates (D3600/D6000: 1.0.0.67+, D6100: 1.0.0.56+, R6100: 1.0.1.20+). If updates cannot be applied, isolate affected devices from untrusted networks to reduce exposure.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-21216 — 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-2018-21216 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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