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NVD / CVE Program· CNA mitre

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 disclo

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.4% (FIRST EPSS); higher than 84.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: keystone (Debian:10) 2:14.2.0-0+deb10u2; keystone (Debian:12) 2:19.0.0-3; keystone (PyPI) 16.0.2, 17.0.1, 18.0.1.

Low priority for now. Upgrade to keystone (Debian:10) 2:14.2.0-0+deb10u2; keystone (Debian:12) 2:19.0.0-3; keystone (PyPI) 16.0.2, 17.0.1, 18.0.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Aug 6, 2021
Updated
Jun 17, 2026
EPSS
2.4% · 84th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.4%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-38155

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
openstackkeystone

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • openstack keystone10.0.0 and later · before 16.0.2
  • openstack keystone17.0.0 and later · before 17.0.1
  • openstack keystone18.0.0 and later · before 18.0.1
  • openstack keystone19.0.0 and later · before 19.0.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10keystonebefore 2:14.2.0-0+deb10u22:14.2.0-0+deb10u2
Debian:12keystonebefore 2:19.0.0-32:19.0.0-3
PyPIkeystonefrom 10.0 · before 16.0.216.0.2
PyPIkeystonefrom 17.0 · before 17.0.117.0.1
PyPIkeystonefrom 18.0 · before 18.0.118.0.1
PyPIkeystonefrom 19.0 · before 19.0.119.0.1
SUSE:HPE Helion OpenStack 8documentation-hpe-helion-openstack-installationbefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:HPE Helion OpenStack 8documentation-hpe-helion-openstack-operationsbefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:HPE Helion OpenStack 8documentation-hpe-helion-openstack-opsconsolebefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:HPE Helion OpenStack 8documentation-hpe-helion-openstack-planningbefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:HPE Helion OpenStack 8documentation-hpe-helion-openstack-securitybefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:HPE Helion OpenStack 8documentation-hpe-helion-openstack-userbefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:HPE Helion OpenStack 8kibanabefore 4.6.6-3.12.14.6.6-3.12.1
SUSE:HPE Helion OpenStack 8openstack-keystonebefore 12.0.4~dev11-5.36.112.0.4~dev11-5.36.1
SUSE:HPE Helion OpenStack 8openstack-keystone-docbefore 12.0.4~dev11-5.36.112.0.4~dev11-5.36.1
SUSE:HPE Helion OpenStack 8openstack-monasca-notificationbefore 1.10.2~dev4-3.9.11.10.2~dev4-3.9.1
SUSE:HPE Helion OpenStack 8venv-openstack-keystonebefore 12.0.4~dev11-11.45.112.0.4~dev11-11.45.1
SUSE:HPE Helion OpenStack 8venv-openstack-monascabefore 2.2.2~dev1-11.45.12.2.2~dev1-11.45.1
SUSE:OpenStack Cloud 8documentation-suse-openstack-cloud-installationbefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:OpenStack Cloud 8documentation-suse-openstack-cloud-operationsbefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:OpenStack Cloud 8documentation-suse-openstack-cloud-opsconsolebefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:OpenStack Cloud 8documentation-suse-openstack-cloud-planningbefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:OpenStack Cloud 8documentation-suse-openstack-cloud-securitybefore 8.20211112-1.38.18.20211112-1.38.1
SUSE:OpenStack Cloud 8documentation-suse-openstack-cloud-supplementbefore 8.20211112-1.38.18.20211112-1.38.1

+36

Same product

openstack: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-12691An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0.
    36Monitor
  • CVE-2020-12690An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0.
    36Monitor
  • CVE-2019-19687OpenStack Keystone 15.0.0 and 16.0.0 is affected by Data Leakage in the list credentials API.
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-12689May 6, 2020 · An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0.
    35Monitor
  • ← EarlierCVE-2020-12692May 6, 2020 · An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0.
    21Monitor
  • Later →CVE-2021-3563Aug 26, 2022 · A flaw was found in openstack-keystone.
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:keystone2:19.0.0-3 · Debian:12Package registry (OSV)
PyPI:keystone16.0.2Package registry (OSV)
PyPI:keystone17.0.1Package registry (OSV)
PyPI:keystone18.0.1Package registry (OSV)
PyPI:keystone19.0.1Package registry (OSV)
suse:documentation-hpe-helion-openstack-installation8.20211112-1.38.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-operations8.20211112-1.38.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-opsconsole8.20211112-1.38.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-planning8.20211112-1.38.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-security8.20211112-1.38.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-user8.20211112-1.38.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:kibana4.6.6-3.12.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:openstack-keystone12.0.4~dev11-5.36.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:openstack-keystone-doc12.0.4~dev11-5.36.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:openstack-monasca-notification1.10.2~dev4-3.9.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:venv-openstack-keystone12.0.4~dev11-11.45.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:venv-openstack-monasca2.2.2~dev1-11.45.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-307 · Improper Restriction of Excessive Authentication Attempts

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records