# CVE-2018-21162: Command injection in n/a

> Unauthenticated attackers can execute arbitrary commands on various NETGEAR routers via command injection vulnerabilities.

- **Severity:** High 8.8 (`CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:U/UI:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Apr 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-m25v-6jm5-xmw4

## What is CVE-2018-21162?

CVE-2018-21162 is a high-severity command injection vulnerability in Netgear D6400 Firmware, published on 23 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects D6400 before 1.0.0.78, EX6200 before 1.0.3.86, EX7000 before 1.0.0.64, R6250 before 1.0.4.8, R6300v2 before 1.0.4.6, R6400 before 1.0.1.12, R6700 before 1.0.1.16, R7000 before 1.0.7.10, R7100LG before 1.0.0.42, R7300DST before 1.0.0.44, R7900 before 1.0.1.12, R8000 before 1.0.3.36, R8300 before 1.0.2.74, R8500 before 1.0.2.74, WNDR3400v3 before 1.0.1.14, and WNR3500Lv2 before 1.2.0.48.

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

## Which versions are affected by CVE-2018-21162?

It affects 16 products.


Products: Netgear D6400 Firmware, Netgear Ex6200 Firmware, Netgear Ex7000 Firmware, Netgear R6250 Firmware, Netgear R6300 Firmware, Netgear R6400 Firmware, Netgear R6700 Firmware, Netgear R7000 Firmware, Netgear R7100lg Firmware, Netgear R7300dst Firmware, Netgear R7900 Firmware, Netgear R8000 Firmware, Netgear R8300 Firmware, Netgear R8500 Firmware, Netgear Wndr3400 Firmware, Netgear Wnr3500l Firmware.

## How do I fix CVE-2018-21162?

No fix has been published for CVE-2018-21162 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-21162 being exploited?

There is no known exploitation of CVE-2018-21162 in the wild and no public exploit code.

## Other vulnerabilities in Netgear D6400 Firmware

- [CVE-2019-20728](https://insights.sbomify.com/CVE-2019-20728/): Memory corruption in n/a (medium 6.3)
- [CVE-2025-7407](https://insights.sbomify.com/CVE-2025-7407/): Netgear D6400 diag.cgi os command injection (medium 5.3)
- [CVE-2017-18700](https://insights.sbomify.com/CVE-2017-18700/): Cross-site scripting in n/a (medium 5.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-21162 and fix it if it is affected.

What it is: CVE-2018-21162 is a high-severity command injection vulnerability in Netgear D6400 Firmware, published on 23 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-21162 in the wild and no public exploit code.

Affected product: Netgear D6400 Firmware. 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-2018-21162/ (Markdown: https://insights.sbomify.com/CVE-2018-21162/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-21162
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-21162
- OSV: https://osv.dev/vulnerability/CVE-2018-21162

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-21162/
Summaries are generated and may contain mistakes; the official description above is the record.