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 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.

Bugs

• <https://launchpad.net/bugs/1688137&gt;