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🐍 PyPI
Not in CISA KEV
HIGH severity

CVE-2021-3563 — keystone

HIGH

CVE-2021-3563 is a high-severity (CVSS 7.4) CWE-863 vulnerability in keystone. 3 public exploit or proof-of-concept references are indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Openstack Keystone Incorrect Authorization vulnerability

Also known asGHSA-cc99-whm5-mmq3PYSEC-2026-370
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
3 known
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.00%0.80%1.61%2.41%0.1%1.9%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍keystone

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

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. A patch is available.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐍PyPIkeystoneall versionsNo fix

Affected Products

3 products · 7 configurations
OS
debian linuxdebian
2 versions
10.011.0
Application
keystoneopenstack
all
Application
openstack platformredhat
4 versions
10.013.016.116.2
Exploits & PoCs
3

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A flaw was found in openstack-keystone. Only the first 72 characters of …

security-tracker.debian.orgNVDAug 2022

Report on bugs.launchpad.net

bugs.launchpad.netNVDAug 2022

Report on bugzilla.redhat.com

bugzilla.redhat.comNVDAug 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for keystone, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of keystone for CVE-2021-3563. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

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. A [patch](https://opendev.org/openstack/keystone/commit/7859ed26003858ebfd9a5e866b43f1a6a9e83dca) is available.
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CVE-2021-3563: keystone (High 7.4)