# CVE-2021-24033: react-dev-utils OS Command Injection in function `getProcessForPort`

> Attackers can execute arbitrary commands if custom code passes user input to the getProcessForPort function in react-dev-utils.

- **Severity:** Medium 5.6 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-5q6m-3h65-w53x

## What is CVE-2021-24033?

CVE-2021-24033 is a medium-severity command injection vulnerability in Facebook react-dev-utils, published on 9 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

react-dev-utils prior to v11.0.4 exposes a function, getProcessForPort, where an input argument is concatenated into a command string to be executed. This function is typically used from react-scripts (in Create React App projects), where the usage is safe. Only when this function is manually invoked with user-provided values (ie: by custom code) is there the potential for command injection. If you're consuming it from react-scripts then this issue does not affect you.

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

## Which versions are affected by CVE-2021-24033?

2 open source packages ship an affected version, including react-dev-utils. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `react-dev-utils` | npm | From 0.4.0 | 11.0.4 |
| `react-dev-utils` | npm | From 0.4.0 | 11.0.4 |

Products: Facebook React-Dev-Utils.

## How do I fix CVE-2021-24033?

Upgrade react-dev-utils to 11.0.4 or later.

## Is CVE-2021-24033 being exploited?

There is no known exploitation of CVE-2021-24033 in the wild and no public exploit code.

## Other vulnerabilities in Facebook react-dev-utils

- [CVE-2018-6342](https://insights.sbomify.com/CVE-2018-6342/): react-dev-utils on Windows vulnerable to Remote Code Execution (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24033 and fix it if it is affected.

What it is: CVE-2021-24033 is a medium-severity command injection vulnerability in Facebook react-dev-utils, published on 9 Mar 2021. 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-2021-24033 in the wild and no public exploit code.

Affected packages and fixed versions:
- react-dev-utils (npm): affected from 0.4.0; fixed in 11.0.4
- react-dev-utils (npm): affected from 0.4.0; fixed in 11.0.4

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-2021-24033/ (Markdown: https://insights.sbomify.com/CVE-2021-24033/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24033
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24033
- OSV: https://osv.dev/vulnerability/CVE-2021-24033

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24033/
Summaries are generated and may contain mistakes; the official description above is the record.