CVE-2018-21101
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 confidenceNETGEAR R7800 devices before firmware version 1.0.2.60 contain a command injection vulnerability in the web management interface. An authenticated attacker can inject malicious commands through input fields that are not properly sanitized, allowing arbitrary OS command execution with the privileges of the web server.
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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Identify the device modelAccess the device admin interface or check the device label/metadata. The device model is displayed on the login page or in the administration section.Affected if The device is not a NETGEAR R7800, then this specific CVE does not apply.
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Check the installed firmware versionLog into the web management interface and navigate to Administration > Firmware Update or Advanced > Administration. The firmware version is displayed on the main status page or in the firmware upgrade section.Affected if The firmware version is less than 1.0.2.60 (for example, 1.0.2.50, 1.0.2.40, etc.). Compare your version number directly against this threshold.
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Verify web management interface accessibilityAttempt to reach the device web interface at http://routerIP (typically 192.168.1.1). Confirm the interface loads and accepts authentication.Affected if The web management interface is exposed to untrusted networks and can be accessed by unauthorized users, increasing the likelihood of exploitation.
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Confirm authentication is requiredVerify that the web management interface enforces login. Attempt to access restricted pages without logging in to confirm redirection to the login page.Affected if The interface allows unauthenticated access to administrative functions, which would make command injection exploitation easier.
You are affected if the device is a NETGEAR R7800 running firmware version 1.0.2.60 or lower, and the web management interface is accessible to potential attackers.
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. Until patched, limit administrative interface access to trusted IP addresses and enforce strong credentials to reduce the attack surface.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-21101 — 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-2018-21101 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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