What’s Vulnerable › Vulnerabilities

CVE-2021-38155

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-06 · updated 2026-06-17
• Weakness: CWE-307

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.

Affected products

• OpenStack Keystone: from 10.0.0 before 16.0.2; from 17.0.0 before 17.0.1; from 18.0.0 before 18.0.1; from 19.0.0 before 19.0.1 — fixed in 16.0.2, 17.0.1, 18.0.1, 19.0.1

How to fix

Upgrade to a fixed version: OpenStack Keystone 16.0.2, 17.0.1, 18.0.1, 19.0.1. Check the vendor advisory for mitigations.

References

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

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