CVE-2018-21151
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 authenticated user. This affects D7800 before 1.0.1.34, R7500v2 before 1.0.3.26, R7800 before 1.0.2.42, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WNDR4300v2 before 1.0.0.54, and WNDR4500v3 before 1.0.0.54.
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 multiple NETGEAR router models (D7800, R7500v2, R7800, R8900, R9000, WNDR4300v2, WNDR4500v3) allows authenticated users to potentially execute arbitrary code or cause denial of service due to improper bounds checking in the firmware.
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< 1.0.3.26< 1.0.2.42< 1.0.3.10< 1.0.3.10< 1.0.0.54< 1.0.0.54CVSS 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 router modelLocate the model number on the device label or check the router's web administration interface (typically at 192.168.1.1) for the exact model designationAffected if Model is D7800, R7500v2, R7800, R8900, R9000, WNDR4300v2, or WNDR4300v2 or WNDR4500v3
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Access firmware version informationLog into the router web interface and navigate to the Administration or Firmware Upgrade section to view the current firmware version installedAffected if Firmware version cannot be determined or is not visible in the admin interface
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Compare version against affected ranges for D7800If model is D7800, compare installed version to 1.0.1.34Affected if Installed version is lower than 1.0.1.34
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Compare version against affected ranges for R7500v2If model is R7500v2, compare installed version to 1.0.3.26Affected if Installed version is lower than 1.0.3.26
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Compare version against affected ranges for R7800, R8900, R9000If model is R7800, compare to 1.0.2.42; if R8900 or R9000, compare to 1.0.3.10Affected if R7800 version < 1.0.2.42, or R8900/R9000 version < 1.0.3.10
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Compare version against affected ranges for WNDR4300v2 and WNDR4500v3If model is WNDR4300v2 or WNDR4500v3, compare installed version to 1.0.0.54Affected if Installed version is lower than 1.0.0.54
User is affected if they have one of the listed router models AND the installed firmware version is below the specified version 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 data1.0.0.541.0.1.341.0.2.42
Update affected NETGEAR devices to the latest firmware version provided by NETGEAR for the specific model (D7800: 1.0.1.34+, R7500v2: 1.0.3.26+, R7800: 1.0.2.42+, R8900/R9000: 1.0.3.10+, WNDR4300v2/WNDR4500v3: 1.0.0.54+).
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-21151 — 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-2018-21151 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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