CVE-2018-21222
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, R6100 before 1.0.1.20, R7500 before 1.0.0.118, R7500v2 before 1.0.3.24, R9000 before 1.0.2.52, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, 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 confidenceMultiple NETGEAR router models contain a buffer overflow vulnerability that can be exploited by an unauthenticated attacker, allowing remote code execution or denial of service without any credentials.
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< 1.0.0.62< 1.0.2.52< 1.0.2.96< 1.0.2.98< 1.0.0.50< 1.0.0.118< 1.0.3.24< 1.0.0.50< 1.0.1.20< 1.0.1.30CVSS 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 modelLocate the model number on the device label or in the router web administration interface, typically found under a Status or Device Information sectionAffected if The model matches one of the affected models: Wnr2000, R9000, Wndr3700, Wndr4300, R7500, Wndr4500, R6100, or D7800
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Determine the installed firmware versionAccess the router web administration interface and navigate to the firmware or status section to view the current firmware version numberAffected if The installed firmware version falls below the threshold specified for that model in the affected products list
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Compare against affected version thresholdsReference the CVE affected products list: Wnr2000 < 1.0.0.62, R9000 < 1.0.2.52, Wndr3700 < 1.0.2.96, Wndr4300 < 1.0.2.98 or < 1.0.0.50, R7500 < 1.0.0.118 or < 1.0.3.24, Wndr4500 < 1.0.0.50, R6100 < 1.0.1.20, D7800 < 1.0.1.30Affected if Your installed firmware version is lower than the listed threshold for your specific model
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Check router management interface exposureVerify whether the router web administration interface is accessible from untrusted networks or the internet by attempting to access the router IP from an external network or reviewing firewall rulesAffected if The management interface is exposed to the internet or untrusted networks without proper access restrictions
You are affected if your router model and firmware version match the affected ranges, especially if the management interface is accessible to unauthenticated users on untrusted networks.
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 data1.0.0.501.0.0.621.0.0.118
Update firmware to the specified versions for each affected model. If updates are unavailable, restrict network access to the router management interface to prevent unauthenticated exploitation.
- 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-2018-21222 — 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-2018-21222 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
- No spam, self-promotion, credentials, or personal data