CVE-2017-18840
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 denial of service. This affects M4300-28G before 12.0.2.15, M4300-52G before 12.0.2.15, M4300-28G-POE+ before 12.0.2.15, M4300-52G-POE+ before 12.0.2.15, M4300-8X8F before 12.0.2.15, M4300-12X12F before 12.0.2.15, M4300-24X24F before 12.0.2.15, M4300-24X before 12.0.2.15, M4300-48X before 12.0.2.15, and M4200 before 12.0.2.15.
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 confidenceA denial of service vulnerability exists in NETGEAR M4300 series switches and M4200 devices. The vulnerability allows an attacker to potentially crash or render the affected devices unavailable. The affected firmware versions are prior to 12.0.2.15.
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< 12.0.2.15< 12.0.2.15< 12.0.2.15< 12.0.2.15< 12.0.2.15< 12.0.2.15< 12.0.2.15< 12.0.2.15CVSS 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
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 device modelLog into the NETGEAR switch web management interface or CLI and locate the device model information, typically found in the dashboard, System Information, or 'show version' command outputAffected if The device is not a NETGEAR M4300 series switch or M4200 device
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Confirm the specific M4300 model variantCheck the exact model number from the device label, web UI, or CLI output (examples: M4300-28G, M4300-52G, M4300-28G-PoE+, M4300-52G-PoE+, M4300-8X8F, M4300-12X12F, M4300-24X24F, M4300-24X)Affected if The model is not one of the eight M4300 variants listed or the M4200
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Locate the firmware version in the deviceIn the web interface, navigate to Maintenance > Firmware Upgrade or System > Management > Device Information. Via CLI, use 'show version' or 'show firmware' commandAffected if The firmware version cannot be retrieved or displayed by the device
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Compare installed version against the vulnerable rangeCompare the firmware version displayed to 12.0.2.15. Note that versions are compared as text or numeric strings, ensuring 12.0.2.15 or higher means patched, while anything below (such as 12.0.0.10, 12.0.1.x, etc.) is vulnerableAffected if The installed firmware version is a version number less than 12.0.2.15 (for example: 12.0.2.14, 12.0.1.5, 12.0.0.18, etc.)
A defender is affected if they have any NETGEAR M4300 series or M4200 device running firmware version lower than 12.0.2.15
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 data12.0.2.15
Update NETGEAR M4300 and M4200 device firmware to version 12.0.2.15 or later to remediate this vulnerability.
- Consultation1.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-18840 — 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-2017-18840 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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