# CVE-2018-0638: Command injection in HC100RC

> An administrator can execute arbitrary OS commands on NEC Aterm HC100RC routers via the import.cgi encKey parameter.

- **Severity:** High 7.2 (`CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Jan 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-2f8j-56q3-mhmr

## What is CVE-2018-0638?

CVE-2018-0638 is a high-severity command injection vulnerability in NEC Corporation HC100RC, published on 9 Jan 2019. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Aterm HC100RC Ver1.0.1 and earlier allows attacker with administrator rights to execute arbitrary OS commands via import.cgi encKey parameter.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2018-0638?

It affects 1 product.


Products: Nec Aterm Hc100rc Firmware.

## How do I fix CVE-2018-0638?

No fix has been published for CVE-2018-0638 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0638 being exploited?

There is no known exploitation of CVE-2018-0638 in the wild and no public exploit code.

## Other vulnerabilities in NEC Corporation HC100RC

- [CVE-2018-0634](https://insights.sbomify.com/CVE-2018-0634/): Command injection in HC100RC (high 7.2)
- [CVE-2018-0635](https://insights.sbomify.com/CVE-2018-0635/): Command injection in HC100RC (high 7.2)
- [CVE-2018-0636](https://insights.sbomify.com/CVE-2018-0636/): Command injection in HC100RC (high 7.2)
- [CVE-2018-0637](https://insights.sbomify.com/CVE-2018-0637/): Command injection in HC100RC (high 7.2)
- [CVE-2018-0639](https://insights.sbomify.com/CVE-2018-0639/): Command injection in HC100RC (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0638 and fix it if it is affected.

What it is: CVE-2018-0638 is a high-severity command injection vulnerability in NEC Corporation HC100RC, published on 9 Jan 2019. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-0638 in the wild and no public exploit code.

Affected product: NEC Corporation HC100RC. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2018-0638/ (Markdown: https://insights.sbomify.com/CVE-2018-0638/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0638
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0638
- OSV: https://osv.dev/vulnerability/CVE-2018-0638

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0638/
Summaries are generated and may contain mistakes; the official description above is the record.