CVE-2018-21099
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 · uneditedNETGEAR R7800 devices before 1.0.2.60 are affected by command injection by an authenticated user.
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 confidenceThe NETGEAR R7800 router firmware before version 1.0.2.60 contains a command injection vulnerability that allows an authenticated attacker to execute arbitrary operating system commands on the device through the web management interface.
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< 1.0.2.60CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:L/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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Confirm device model is Netgear R7800Access the router web management interface or check the device label. The model number R7800 is typically displayed on the device itself or in the web UI header or status page.Affected if The device is not a Netgear R7800 router.
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Locate the firmware versionIn the router web management interface, navigate to the Administration, Firmware, or Settings section to find the currently installed firmware version. This is often displayed on the main status dashboard or in an 'Upgrade' menu item.Affected if Unable to determine the installed firmware version.
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Compare firmware version to affected rangeCompare the installed firmware version number against version 1.0.2.60. Note that versions below 1.0.2.60 are affected (e.g., 1.0.2.50, 1.0.2.40, etc.).Affected if The installed firmware version is less than 1.0.2.60.
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Verify web management interface accessibilityDetermine if the router web management interface is accessible from network locations where untrusted users could connect. This can include checking remote management settings (often under 'Advanced' > 'Administration' > 'Remote Management').Affected if The web management interface is exposed to untrusted networks and the firmware version is below 1.0.2.60.
The environment is affected if the device is a Netgear R7800 running firmware version lower than 1.0.2.60 and the web management interface is accessible to untrusted users.
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 data1.0.2.60
Upgrade NETGEAR R7800 firmware to version 1.0.2.60 or later to address the command injection vulnerability. If immediate patching is not possible, restrict administrative interface access to trusted networks only.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-21099 — 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-2018-21099 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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