CVE-2018-21150
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 stack-based buffer overflow by an authenticated user. This affects D7800 before 1.0.1.34, DM200 before 1.0.0.50, R6100 before 1.0.1.22, R7500 before 1.0.0.122, R7500v2 before 1.0.3.26, R7800 before 1.0.2.42, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.54, WNDR4500v3 before 1.0.0.54, and WNR2000v5 before 1.0.0.64.
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 · moderate confidenceA stack-based buffer overflow vulnerability exists in multiple NETGEAR router firmware versions. An authenticated user can trigger the overflow, potentially leading to code execution or device compromise. The vulnerability affects 13 different NETGEAR device models across various firmware branches.
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< 1.0.1.34< 1.0.0.50< 1.0.1.22< 1.0.0.122< 1.0.3.26< 1.0.2.42< 1.0.3.10< 1.0.3.10< 1.0.2.96CVSS 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:H/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 modelLocate the device model number on the router hardware label or check the admin interface system information pageAffected if The model is one of: D7800, Dm200, R6100, R7500, R7800, R8900, R9000, or Wndr3700
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Determine the installed firmware versionAccess the router admin web interface and navigate to the Firmware Version or System Info section, or use the router's CLI if availableAffected if The displayed firmware version is below the safe threshold for your model
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Compare against affected version rangesMatch your model and firmware version against the following thresholds: D7800 < 1.0.1.34, Dm200 < 1.0.0.50, R6100 < 1.0.1.22, R7500 < 1.0.0.122 or < 1.0.3.26, R7800 < 1.0.2.42, R8900 < 1.0.3.10, R9000 < 1.0.3.10, Wndr3700 < 1.0.2.96Affected if Your firmware version falls below the specified threshold for your exact model
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Confirm administrative access methodVerify how the router admin interface is accessible: check if remote web management is enabled, and review who has valid administrator credentialsAffected if The router admin interface is exposed to untrusted users or the default credentials are in use, since this vulnerability requires an authenticated user session
You are affected if your NETGEAR router matches one of the eight listed models and your current firmware version is below the specified threshold for that model.
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 data1.0.0.501.0.0.1221.0.1.22
Apply the available NETGEAR firmware updates for each affected model to remediate this vulnerability. Restrict administrative access to trusted users to reduce the attack surface.
- Consultation3.0 h
- Implementation6.0 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-2018-21150 — 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-2018-21150 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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