CVE-2018-21098
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 · moderate confidenceThis is an authenticated command injection vulnerability in NETGEAR R7800 router firmware versions prior to 1.0.2.60. An authenticated attacker can inject arbitrary operating system commands through the web interface, likely through improperly sanitized input fields in the router's administrative 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
- 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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Confirm device model is NETGEAR R7800Access the router web interface or check the device label. The vulnerability applies only to this specific model.Affected if Device is anything other than NETGEAR R7800
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Check installed firmware versionLog into the router web interface and navigate to Administration > Firmware Update or check the status page for the current firmware version. Compare the version number to 1.0.2.60.Affected if Firmware version is below 1.0.2.60 (for example, 1.0.2.40 or 1.0.2.50)
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Verify the router web management interface is accessibleAttempt to reach the router's web interface at its LAN IP address (typically 192.168.1.1). The command injection occurs through this interface.Affected if The web interface responds and accepts authentication
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Check if remote management is enabledIn the router web interface, go to Advanced > Remote Management to see if remote access over WAN is enabled. This determines if the vulnerability could be exploited from outside the local network.Affected if Remote management is enabled and the router is accessible from the internet
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Look for signs of unauthorized administrative accessReview router logs (under Administration > Logs) for unexpected administrative logins, unfamiliar configuration changes, or commands that were not issued by legitimate administrators.Affected if Logs show administrative activity that was not performed by known administrators
The environment is affected if the device is a NETGEAR R7800 running firmware version 1.0.2.60 or lower, and the attacker can reach the authenticated 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 data1.0.2.60
Update NETGEAR R7800 firmware to version 1.0.2.60 or later. If updating is not immediately possible, limit administrative access to trusted users and monitor for unauthorized access.
- Consultation2.0 h
- Implementation1.0 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-2018-21098 — 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-2018-21098 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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