CVE-2018-0638
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 · uneditedAterm HC100RC Ver1.0.1 and earlier allows attacker with administrator rights to execute arbitrary OS commands via import.cgi encKey parameter.
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 confidenceThis is an OS command injection vulnerability in the Aterm HC100RC router web interface. An authenticated attacker with administrator access can execute arbitrary operating system commands by injecting malicious input through the encKey parameter of the import.cgi script.
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<= 1.0.1CVSS 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
- Network
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/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 device model and firmware versionAccess the router's web administration interface and navigate to the firmware version information page, typically found under 'System' or 'Status' settings. Alternatively, check the bottom of the router device for a label displaying the model number and firmware version.Affected if The device is a Nec Aterm HC100rc with firmware version 1.0.1 or earlier (any version <= 1.0.1).
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Confirm the web interface is accessibleAttempt to access the router's web interface by entering the device's IP address in a web browser. The default Aterm HC100RC interface typically uses http://192.168.0.1 or http://192.168.1.1.Affected if The web administrative interface is reachable from an untrusted network segment or the internet.
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Verify administrative access statusAttempt to log into the router's web interface using known default credentials or confirm whether strong, unique passwords are configured for administrator accounts. Default credentials for Aterm devices are often admin/admin or admin/password.Affected if The default administrative credentials have not been changed, or weak/simple passwords are in use for administrator accounts.
A user is affected if they are running Nec Aterm HC100rc firmware version 1.0.1 or lower AND the device's web interface is accessible with administrative credentials.
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 dataUpdate the Aterm HC100RC firmware to a version newer than 1.0.1. Additionally, restrict administrative access to the device's web interface to trusted IP addresses only, and review administrative accounts for unauthorized access.
- Consultation3.0 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-2018-0638 — 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-2018-0638 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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