CVE-2018-21153
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 D7800 before 1.0.1.34, DM200 before 1.0.0.50, EX2700 before 1.0.1.32, EX6100v2 before 1.0.1.70, EX6150v2 before 1.0.1.70, EX6200v2 before 1.0.1.62, EX6400 before 1.0.1.78, EX7300 before 1.0.1.62, EX8000 before 1.0.0.114, R6100 before 1.0.1.22, R7500 before 1.0.0.122, R7500v2 before 1.0.3.26, R7800 before 1.0.2.40, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WN2000RPTv3 before 1.0.1.26, WN3000RPv2 before 1.0.0.56, WN3000RPv3 before 1.0.2.66, WN3100RPv2 before 1.0.0.56, 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 · high confidenceBuffer overflow vulnerability in NETGEAR router and range extender firmware allows unauthenticated remote attackers to execute arbitrary code or cause denial of service. The vulnerability affects 23 different NETGEAR device models across multiple product lines (D, DM, EX, R, WN series) with specific unpatched firmware versions.
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< 1.0.1.32< 1.0.1.70< 1.0.1.70< 1.0.1.62< 1.0.1.78< 1.0.1.62CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/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 device modelLog into the router web administration interface (typically at 192.168.1.1) and look for the model number displayed on the dashboard or status page, or check the physical device label on the hardware itselfAffected if The device model is one of the affected models: D7800, Dm200, Ex2700, Ex6100, Ex6150, Ex6200, Ex6400, Ex7300 (or other models in the D, DM, EX, R, WN series)
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Identify the installed firmware versionIn the router web interface, navigate to the Firmware Update or Administration section and locate the current firmware version displayed (often labeled as 'Firmware Version' or 'Router Version')Affected if The firmware version displayed is lower than the patch version for your specific model
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Compare firmware version against affected rangesMatch your device model and installed firmware version against the affected version thresholds: D7800 < 1.0.1.34, Dm200 < 1.0.0.50, Ex2700 < 1.0.1.32, Ex6100 < 1.0.1.70, Ex6150 < 1.0.1.70, Ex6200 < 1.0.1.62, Ex6400 < 1.0.1.78, Ex7300 < 1.0.1.62Affected if Your installed firmware version falls below the listed threshold for your specific device model
You are affected if you are running any of the listed NETGEAR router or range extender models with firmware versions below the specified thresholds.
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.
dbcve · scoped1.0.0.501.0.1.321.0.1.34
Apply the vendor-supplied firmware updates for each affected device model. If updates are unavailable, disable remote administration and restrict network access to device management interfaces.
Upgrade to firmware version 1.0.1.34 or later for D7800; 1.0.0.50 or later for Dm200; 1.0.1.32 or later for Ex2700; 1.0.1.70 or later for Ex6100/Ex6150; 1.0.1.62 or later for Ex6200/Ex7300; 1.0.1.78 or later for Ex6400; or the versions specified in the full CVE for other models
- 1. Identify the exact NETGEAR device model from the affected list (D7800, Dm200, Ex2700, Ex6100, Ex6150, Ex6200, Ex6400, Ex7300, or other models listed in the full CVE description)
- 2. Access the device's web administration interface by entering the router's IP address in a web browser
- 3. Navigate to the Administration or Firmware Update section (often under Advanced > Administration > Firmware Update)
- 4. Check the current firmware version under the device status or administration page
- 5. Download the appropriate fixed firmware from the NETGEAR support website (support.netgear.com) for your specific model
- 6. In the firmware update section, use the manual firmware upload option to select the downloaded firmware file
- 7. Wait for the upload to complete and for the device to reboot - do not power off the device during this process
- 8. After reboot, verify the new firmware version matches or exceeds the fixed version for your device
Generated from the published advisory — verify against the referenced sources before acting.
- 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-2018-21153 — 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-2018-21153 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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