# CVE-2021-45987: Command injection in n/a

> Attackers can execute arbitrary commands on Tenda G1 and G3 routers via the hostName parameter in the formSetNetCheckTools function.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Feb 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-h3vm-v3m8-p5m3

## What is CVE-2021-45987?

CVE-2021-45987 is a critical command injection vulnerability in n/a, published on 4 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Tenda routers G1 and G3 v15.11.0.17(9502)_CN were discovered to contain a command injection vulnerability in the function formSetNetCheckTools. This vulnerability allows attackers to execute arbitrary commands via the hostName parameter.

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

## Which versions are affected by CVE-2021-45987?

It affects 2 products.


Products: Tendacn G1 Firmware, Tendacn G3 Firmware.

## How do I fix CVE-2021-45987?

No fix has been published for CVE-2021-45987 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-45987 being exploited?

There is no known exploitation of CVE-2021-45987 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-45986](https://insights.sbomify.com/CVE-2021-45986/): Command injection in n/a (critical 9.8)
- [CVE-2021-45990](https://insights.sbomify.com/CVE-2021-45990/): Command injection in n/a (critical 9.8)
- [CVE-2022-24165](https://insights.sbomify.com/CVE-2022-24165/): Command injection in n/a (critical 9.8)
- [CVE-2022-24167](https://insights.sbomify.com/CVE-2022-24167/): Command injection in n/a (critical 9.8)
- [CVE-2022-24168](https://insights.sbomify.com/CVE-2022-24168/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-45987 and fix it if it is affected.

What it is: CVE-2021-45987 is a critical command injection vulnerability in n/a, published on 4 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-45987 in the wild and no public exploit code.

Affected product: n/a. 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-2021-45987/ (Markdown: https://insights.sbomify.com/CVE-2021-45987/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45987
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45987
- OSV: https://osv.dev/vulnerability/CVE-2021-45987

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45987/
Summaries are generated and may contain mistakes; the official description above is the record.