CVE-2018-21145
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 D7800 before 1.0.1.34, DM200 before 1.0.0.50, R6100 before 1.0.1.22, R7500 before 1.0.0.122, R7800 before 1.0.2.42, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WNDR3700v4 before 1.0.2.96, 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 confidenceA stack-based buffer overflow vulnerability exists in multiple NETGEAR router models (D7800, DM200, R6100, R7500, R7800, R8900, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, WNR2000v5). An authenticated user can exploit this to potentially execute arbitrary code or cause a denial of service.
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< 1.0.1.22< 1.0.0.122< 1.0.2.42< 1.0.3.10< 1.0.3.10< 1.0.2.96CVSS 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 log into the router web interface and check the status or administration page for the exact model numberAffected if Model is D7800, DM200, R6100, R7500, R7800, R8900, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, or WNR2000v5
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Check firmware versionLog into the router web interface and navigate to Administration > Firmware Update or Router Status page to view the installed firmware versionAffected if Firmware version is below 1.0.1.34 (D7800), 1.0.0.50 (DM200), 1.0.1.22 (R6100), 1.0.0.122 (R7500), 1.0.2.42 (R7800), 1.0.3.10 (R8900/R9000), or 1.0.2.96 (WNDR3700v4)
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Confirm remote administration accessCheck router settings under Advanced > Remote Management or Administration > Remote Management to see if remote access is enabledAffected if Remote web management is enabled and accessible from the internet, allowing an attacker to obtain authentication credentials
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Verify web interface accessibilityAttempt to access the router web interface from an external network or check firewall/NAT rules that may expose port 80/443 to the internetAffected if The router administrative interface is exposed to the internet without VPN or proper access controls
The environment is affected if the router model matches one of the listed models AND the installed firmware version falls below the specified threshold AND the attacker can reach the authentication interface.
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 data1.0.0.501.0.0.1221.0.1.22
Upgrade router firmware to the versions specified in the advisory (D7800 to 1.0.1.34, DM200 to 1.0.0.50, R6100 to 1.0.1.22, R7500 to 1.0.0.122, R7800 to 1.0.2.42, R8900/R9000 to 1.0.3.10, WNDR3700v4 to 1.0.2.96, WNDR4300 to 1.0.2.98, WNDR4300v2/WNDR4500v3 to 1.0.0.54, WNR2000v5 to 1.0.0.64) or later.
- Consultation3.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-21145 — 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-2018-21145 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
- No spam, self-promotion, credentials, or personal data