CVE-2018-21210
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, D7800 before 1.0.1.30, EX2700 before 1.0.1.28, R6100 before 1.0.1.20, R7500 before 1.0.0.118, R7500v2 before 1.0.3.24, R7800 before 1.0.2.40, R9000 before 1.0.2.52, WN2000RPTv3 before 1.0.1.20, WN3000RPv3 before 1.0.2.50, WN3100RPv2 before 1.0.0.56, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.50, and WNDR4500v3 before 1.0.0.50.
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 confidenceBuffer overflow vulnerability in multiple NETGEAR router models allows unauthenticated remote attackers to execute arbitrary code via specially crafted network requests. The vulnerability exists in the firmware web interface and can be exploited without authentication, potentially giving attackers full control of the affected device.
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< 1.0.0.67< 1.0.0.67< 1.0.1.30< 1.0.1.28< 1.0.1.20< 1.0.0.118< 1.0.3.24< 1.0.2.40< 1.0.2.52CVSS 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 NETGEAR router modelLocate the model number on the device label or check the router web interface status pageAffected if The model is D3600, D6000, D7800, Ex2700, R6100, R7500, R7800, or R900
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Check the installed firmware versionLog into the router web interface and navigate to Administration > Firmware Update or Router Status page to view the current firmware versionAffected if The firmware version is below 1.0.0.67 for D3600/D6000, below 1.0.1.30 for D7800, below 1.0.1.28 for Ex2700, below 1.0.1.20 for R6100, below 1.0.0.118 or 1.0.3.24 for R7500, below 1.0.2.40 for R7800, or below 1.0.2.52 for R900
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Verify the router web interface is accessibleAttempt to reach the router IP address (typically 192.168.1.1) via HTTP/HTTPS from the networkAffected if The router web interface is reachable and responds to requests - this is the attack surface
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Check if remote management is enabledIn the router web interface, go to Advanced > Remote Management or similar settings to see if remote access to the web interface is enabled from WANAffected if Remote management or WAN access to the web interface is enabled, increasing exposure to unauthenticated attackers
You are affected if you own one of the listed NETGEAR models AND your firmware version is below the specified threshold, since the vulnerability is in the web interface and exploitable without authentication.
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 data1.0.0.671.0.0.1181.0.1.20
Apply available firmware updates from NETGEAR for each affected model. If updates are unavailable, consider network segmentation to limit exposure and monitor for indicators of compromise.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-21210 — 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-2018-21210 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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