CVE-2021-23420

Name: CVE-2021-23420
Creator: NVD / NIST
Published: 2021-08-11T13:15:16.057+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.71%

Last modified Jun 17, 2026

CVE-2021-23420 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.71% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.71%

84.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Codeception	Codeception	< 3.1.3
Codeception	Codeception	>= 4.0.0, < 4.1.22

References

https://github.com/Codeception/Codeception/blob/4.1/ext/RunProcess.php%23L52Broken Link
https://github.com/Codeception/Codeception/pull/6241Patch, Third Party Advisory
https://github.com/JinYiTong/pocExploit, Third Party Advisory
https://snyk.io/vuln/SNYK-PHP-CODECEPTIONCODECEPTION-1324585Third Party Advisory
https://github.com/Codeception/Codeception/blob/4.1/ext/RunProcess.php%23L52Broken Link
https://github.com/Codeception/Codeception/pull/6241Patch, Third Party Advisory
https://github.com/JinYiTong/pocExploit, Third Party Advisory
https://snyk.io/vuln/SNYK-PHP-CODECEPTIONCODECEPTION-1324585Third Party Advisory

Timeline

Published: Aug 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23420?

How severe is CVE-2021-23420?

CVE-2021-23420 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.71% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23420?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23420?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST