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Fencer Intel
high 7.4

CVE-2021-3563 json

Openstack Keystone Incorrect Authorization vulnerability

published 4y ago modified 13d ago also GHSA-cc99-whm5-mmq3 , PYSEC-2026-370 , EUVD-2022-6535

cvss
7.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

A flaw was found in openstack-keystone. Only the first 72 characters of an application secret are verified allowing attackers bypass some password complexity which administrators may be counting on. The highest threat from this vulnerability is to data confidentiality and integrity.

Patch / fix

  • keystone Debian 14, Debian 13 2:23.0.0-3

debian advisories DEBIAN-CVE-2021-3563

  • keystone Ubuntu 22.04 LTS 2:21.0.1-0ubuntu2.1

ubuntu advisories UBUNTU-CVE-2021-3563

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3563 updated cvss 7.4

Keystone: Verification of application credentials is silently length-limited

  • Red Hat OpenStack Platform 10 (Newton) python-keystone, openstack-keystone, python-keystone-tests Red Hat OpenStack Platform 13 (Queens) python-keystone, openstack-keystone
    affected: no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 16.1 python3-keystone, openstack-keystone
    affected: no fix available
  • Red Hat OpenStack Platform 16.2 python3-keystone, openstack-keystone
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 17.0 python3-keystone, openstack-keystone
    affected: no fix planned “Out of support scope”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.86% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/ossa/+bug/1901891 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1962908 referenced PoC, tagged "exploit" by a source, unverified
  • security-tracker.debian.org https://security-tracker.debian.org/tracker/CVE-2021-3563 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi keystone
<=21.0.0
 no fix listed

Affected products

  • n/a keystone

Classification

Weakness

References

Sources

Fencer Intel 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.