CVE-2018-21154
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 command injection 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, R7500v2 before 1.0.3.26, and R7800 before 1.0.2.42.
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 (D7800, DM200, R6100, R7500, R7500v2, R7800) contain an OS command injection vulnerability in their web interface that can be exploited by an authenticated user, allowing arbitrary command execution on the underlying operating system.
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< 1.0.3.26< 1.0.2.42CVSS 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 router device label or in the web interface under Administration > Router StatusAffected if Model is D7800, DM200, R6100, R7500, R7500v2, or R7800
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Check firmware versionLog into the router web interface and navigate to Administration > Router Status or look for a Firmware Version fieldAffected if Version cannot be directly verified through standard web interface (requires manual inspection or telnet/SSH access to check actual running version)
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Compare firmware version to affected rangesMatch your firmware version against the vulnerable ranges: D7800 < 1.0.1.34, DM200 < 1.0.0.50, R6100 < 1.0.1.22, R7500 < 1.0.0.122 (or < 1.0.3.26 for v2), R7800 < 1.0.2.42Affected if Your firmware version falls below the specified version for your model
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Verify web interface accessibilityConfirm the router web management interface is enabled and reachable on your local network (typically at http://192.168.1.1)Affected if Web interface is accessible and the router is running a vulnerable firmware version
Your router is affected if it is one of the listed models (D7800, DM200, R6100, R7500, R7500v2, R7800) AND its firmware version is below the specified threshold, making the command injection vulnerability exploitable by any authenticated user of the web 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
Update router firmware to the patched versions: D7800 to 1.0.1.34+, DM200 to 1.0.0.50+, R6100 to 1.0.1.22+, R7500 to 1.0.0.122+, R7500v2 to 1.0.3.26+, and R7800 to 1.0.2.42+.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-21154 — 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-2018-21154 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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