# CVE-2022-21173: Command injection in ELECOM LAN routers

> An attacker on the adjacent network can execute arbitrary OS commands on ELECOM LAN routers due to hidden functionality.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 8 Feb 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-4xq4-ppq9-6vrh

## What is CVE-2022-21173?

CVE-2022-21173 is a high-severity command injection vulnerability in ELECOM LAN routers, published on 8 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Hidden functionality vulnerability in ELECOM LAN routers (WRH-300BK3 firmware v1.05 and earlier, WRH-300WH3 firmware v1.05 and earlier, WRH-300BK3-S firmware v1.05 and earlier, WRH-300DR3-S firmware v1.05 and earlier, WRH-300LB3-S firmware v1.05 and earlier, WRH-300PN3-S firmware v1.05 and earlier, WRH-300WH3-S firmware v1.05 and earlier, and WRH-300YG3-S firmware v1.05 and earlier) allows an attacker on the adjacent network to execute an arbitrary OS command via unspecified vectors.

## Which versions are affected by CVE-2022-21173?

It affects 8 products.


Products: Elecom Wrh-300bk3-S Firmware, Elecom Wrh-300bk3 Firmware, Elecom Wrh-300dr3-S Firmware, Elecom Wrh-300lb3-S Firmware, Elecom Wrh-300pn3-S Firmware, Elecom Wrh-300wh3-S Firmware, Elecom Wrh-300wh3 Firmware, Elecom Wrh-300yg3-S Firmware.

## How do I fix CVE-2022-21173?

No fix has been published for CVE-2022-21173 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-21173 being exploited?

There is no known exploitation of CVE-2022-21173 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-21173 and fix it if it is affected.

What it is: CVE-2022-21173 is a high-severity command injection vulnerability in ELECOM LAN routers, published on 8 Feb 2022. 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-2022-21173 in the wild and no public exploit code.

Affected product: ELECOM LAN routers. 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-2022-21173/ (Markdown: https://insights.sbomify.com/CVE-2022-21173/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-21173
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-21173
- OSV: https://osv.dev/vulnerability/CVE-2022-21173

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-21173/
Summaries are generated and may contain mistakes; the official description above is the record.