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Fencer Vulns
high 7.5

CVE-2021-38155 json

OpenStack Keystone allows information disclosure during account locking

published 2021-08-06 5 y ago modified 2026-07-07 4 mo ago also GHSA-4225-97pr-rr52 , PYSEC-2026-830 , EUVD-2022-2263

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi keystone 16.0.2, 17.0.1, 18.0.1, 19.0.1
  • openstack keystone 16.0.2, 17.0.1, 18.0.1, 19.0.1
  • keystone Debian 14, Debian 13, Debian 12 2:19.0.0-3

debian advisories DEBIAN-CVE-2021-38155

  • grafana OpenStack Cloud Crowbar 9, OpenStack Cloud 9 6.7.4-3.26.1
  • python-lxml OpenStack Cloud Crowbar 9, OpenStack Cloud 9 4.2.4-3.3.1
  • python-Pillow OpenStack Cloud Crowbar 9, OpenStack Cloud 9 5.2.0-3.17.1
  • ardana-barbican OpenStack Cloud 9 9.0+git.1644879908.8a641c1-3.13.1
  • rubygem-sinatra OpenStack Cloud Crowbar 9 1.4.6-4.3.1
  • openstack-cinder OpenStack Cloud Crowbar 9, OpenStack Cloud 9 13.0.10~dev24-3.34.2
  • openstack-ironic OpenStack Cloud Crowbar 9, OpenStack Cloud 9 11.1.5~dev18-3.28.2
  • openstack-neutron OpenStack Cloud Crowbar 9, OpenStack Cloud 9 13.0.8~dev206-3.40.1

suse advisories SUSE-SU-2022:1729-1SUSE-SU-2022:1654-1

Exploit prediction

2.48% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • launchpad.net https://launchpad.net/bugs/1688137 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
pypi keystone
>=10.0, <16.0.2
>=17.0, <17.0.1
>=18.0, <18.0.1
>=19.0, <19.0.1
16.0.2
17.0.1
18.0.1
19.0.1

Classification

Weakness
  • CWE-307 Improper Restriction of Excessive Authentication Attempts

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.