# CVE-2021-42872: Command injection in n/a

> Remote attackers can execute arbitrary code on TOTOLINK EX1200T routers via a command injection vulnerability.

- **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:** 31 May 2022
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-8rw9-r52p-wrmg

## What is CVE-2021-42872?

CVE-2021-42872 is a critical command injection vulnerability in n/a, published on 31 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

TOTOLINK EX1200T V4.1.2cu.5215 is affected by a command injection vulnerability that can remotely execute arbitrary code.

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

## Which versions are affected by CVE-2021-42872?

It affects 1 product.


Products: Totolink Ex1200t Firmware.

## How do I fix CVE-2021-42872?

No fix has been published for CVE-2021-42872 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42872 being exploited?

There is no known exploitation of CVE-2021-42872 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-51451](https://insights.sbomify.com/CVE-2025-51451/): Auth bypass in n/a (critical 9.8)
- [CVE-2025-28038](https://insights.sbomify.com/CVE-2025-28038/): Command injection in n/a (critical 9.8)
- [CVE-2025-28039](https://insights.sbomify.com/CVE-2025-28039/): Command injection in n/a (critical 9.8)
- [CVE-2023-52032](https://insights.sbomify.com/CVE-2023-52032/): Command injection in n/a (critical 9.8)
- [CVE-2021-42884](https://insights.sbomify.com/CVE-2021-42884/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42872 and fix it if it is affected.

What it is: CVE-2021-42872 is a critical command injection vulnerability in n/a, published on 31 May 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-2021-42872 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-2021-42872/ (Markdown: https://insights.sbomify.com/CVE-2021-42872/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42872
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42872
- OSV: https://osv.dev/vulnerability/CVE-2021-42872

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42872/
Summaries are generated and may contain mistakes; the official description above is the record.