vantage6 vulnerable to username timing attack

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

3.7 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

• CVE-2024-21671: 0.40% estimated exploitation activity in the next 30 days; percentile 34.42 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact It is possible to find out usernames from the response time of login requests. This could aid attackers in credential attacks Workarounds No

Published by the source

30 Jan 2024, 20:56 UTC

Last modified by the source

7 Jul 2026, 17:57 UTC

Source last checked

26 Oct 2026, 13:12 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-45gq-q4xh-cp53

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record PYSEC-2024-31

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-45gq-q4xh-cp53

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# Patch Next advisory brief: CVE-2024-21671

Advisory: vantage6 vulnerable to username timing attack
IDs: CVE-2024-21671, GHSA-45gq-q4xh-cp53
Record: https://patchnext.com/advisories/cve-2024-21671 (revision 3, source checked 26 Oct 2026, 13:12 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 3.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: vantage6 4.2.0; vantage6-server 4.2.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI vantage6: affected < 4.2.0; fixed in 4.2.0
- PyPI vantage6-server: affected < 4.2.0; fixed in 4.2.0

## Suggested inspection (read-only)
- `python -m pip show vantage6`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show vantage6-server`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on vantage6, vantage6-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-45gq-q4xh-cp53 (OSV record GHSA-45gq-q4xh-cp53 lists affected ranges: PyPI vantage6-server >=0 <4.2.0 (fixed))
- Verified: https://osv.dev/vulnerability/PYSEC-2024-31 (OSV record PYSEC-2024-31 lists affected ranges: PyPI vantage6 >=0 <4.2.0 (fixed))
- Verified: https://github.com/advisories/GHSA-45gq-q4xh-cp53 (GitHub-reviewed advisory GHSA-45gq-q4xh-cp53 lists affected ranges: PyPI vantage6-server >=0 <4.2.0)

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