Vulnerability in OpenStack Keystone
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.025 (84.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- launchpad.net/bugs/1688137 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- security.openstack.org/ossa/OSSA-2021-003.html (Patch, Vendor Advisory)
- www.openwall.com/lists/oss-security/2021/08/10/5 (mailing-list, Patch, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2024/01/msg00007.html (mailing-list)
Frequently asked questions
- What is CVE-2021-38155?
- CVE-2021-38155 is a high-severity vulnerability in OpenStack Keystone, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.5/10. Published 2021-08-06.
- How severe is CVE-2021-38155?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-38155 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.