CVE-2021-23771

Name: CVE-2021-23771
Creator: NVD / NIST
Published: 2022-03-17T12:15:07.74+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.00%

Last modified Jun 17, 2026

CVE-2021-23771 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. This affects all versions of package notevil; all versions of package argencoders-notevil. It is vulnerable to Sandbox Escape leading to Prototype pollution. EPSS estimates a 1.00% chance of exploitation in the next 30 days.

Description

This affects all versions of package notevil; all versions of package argencoders-notevil. It is vulnerable to Sandbox Escape leading to Prototype pollution. The package fails to restrict access to the main context, allowing an attacker to add or modify an object's prototype. **Note:** This vulnerability derives from an incomplete fix in [SNYK-JS-NOTEVIL-608878](https://security.snyk.io/vuln/SNYK-JS-NOTEVIL-608878).

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.00%

58.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1321

Affected Software

Vendor	Product	Versions
Argencoders-Notevil Project	Argencoders-Notevil	<= 2.5.0
Notevil Project	Notevil	<= 1.3.3

References

https://snyk.io/vuln/SNYK-JS-ARGENCODERSNOTEVIL-2388587Exploit, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-NOTEVIL-2385946Exploit, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-ARGENCODERSNOTEVIL-2388587Exploit, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-NOTEVIL-2385946Exploit, Third Party Advisory

Timeline

Published: Mar 17, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23771?

How severe is CVE-2021-23771?

CVE-2021-23771 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.00% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23771?

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-2021-23771?

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

Scan your code now

Source: NVD / NIST