CVE-2018-21195
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 D6100 before 1.0.0.57, D7800 before 1.0.1.34, R6100 before 1.0.1.20, R7500v2 before 1.0.3.24, R7800 before 1.0.2.40, R9000 before 1.0.3.6, WNDR3700v4 before 1.0.2.92, WNDR4300 before 1.0.2.94, WNDR4300v2 before 1.0.0.50, WNDR4500v3 before 1.0.0.50, and WNR2000v5 before 1.0.0.62.
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 confidenceStack-based buffer overflow vulnerability in multiple NETGEAR router firmware versions allowing authenticated users to potentially execute arbitrary code via the overflow. The vulnerability affects 11 different NETGEAR router models across multiple product lines including D6100, D7800, R6100, R7500v2, R7800, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, and WNR2000v5.
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< 1.0.0.57< 1.0.1.34< 1.0.1.20< 1.0.3.24< 1.0.2.40< 1.0.3.6< 1.0.2.92< 1.0.2.94< 1.0.0.50CVSS 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 NETGEAR router modelLocate the model number on the device label or check the administration web interface (typically at 192.168.1.1) under the Status or Router Info pageAffected if The model is D6100, D7800, R6100, R7500v2, R7800, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, or WNR2000v5
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Check the installed firmware versionLog into the router web interface and navigate to Administration > Firmware Update or Advanced > Administration > Firmware Version. The version is typically displayed on the main Status pageAffected if The displayed firmware version is below the threshold for your specific model (see version list)
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Compare firmware version against affected rangesMatch your model and firmware version to the affected version list: D6100 < 1.0.0.57, D7800 < 1.0.1.34, R6100 < 1.0.1.20, R7500 < 1.0.3.24, R7800 < 1.0.2.40, R9000 < 1.0.3.6, WNDR3700 < 1.0.2.92, WNDR4300 < 1.0.2.94 or < 1.0.0.50, WNDR4300v2 < 1.0.2.94, WNDR4500v3 < 1.0.2.94, WNR2000v5 < 1.0.0.56Affected if Your firmware version falls below the specified threshold for your model
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Verify authentication is required for exploitationConfirm whether remote management is enabled and accessible. The vulnerability requires an authenticated session to the router admin interfaceAffected if The router admin interface is accessible with credentials (default or custom) and the firmware version is vulnerable
You are affected if your NETGEAR router model matches one of the 11 listed models AND your installed firmware version is below the threshold specified 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 data1.0.0.501.0.0.571.0.1.20
Update affected NETGEAR devices to the specified firmware versions or later to remediate the vulnerability.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-21195 — 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-2018-21195 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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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