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.

• CWE-307

• http://www.openwall.com/lists/oss-security/2021/08/10/5Mailing List, Patch, Third Party Advisory
• https://launchpad.net/bugs/1688137Exploit, Issue Tracking, Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2024/01/msg00007.html
• https://security.openstack.org/ossa/OSSA-2021-003.htmlPatch, Vendor Advisory
• http://www.openwall.com/lists/oss-security/2021/08/10/5Mailing List, Patch, Third Party Advisory
• https://launchpad.net/bugs/1688137Exploit, Issue Tracking, Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2024/01/msg00007.html
• https://security.openstack.org/ossa/OSSA-2021-003.htmlPatch, Vendor Advisory

Published

Aug 6, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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