7.5

CVE-2021-38155: openstack keystone

Modified
AliasesGHSA-4225-97pr-rr52PYSEC-2026-830UBUNTU-CVE-2021-38155
Published 06-08-2021Last modified 04-08-2024

Vulnerability summary

CVE-2021-38155 is a high (CVSS 7.5) vulnerability in openstack keystone. EPSS estimates a 2.48% chance of exploitation in the next 30 days, higher than 84.5% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
2.48%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 3 · Related 2
DLA-3714-1SUSE-SU-2022:1654-1SUSE-SU-2022:1729-1

Timeline

  1. 06-08-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

2.48%

Chance of exploitation in the next 30 days

Percentile

85%

Versus all other CVEs

30-day change

No change 0.00 pp

From 2.48% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (launchpad.net)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • keystone< 2:19.0.0-3
Openstack1 product
  • keystone≥ 10.0.0, < 16.0.2 | ≥ 17.0.0, < 17.0.1 | ≥ 18.0.0, < 18.0.1 | ≥ 19.0.0, < 19.0.1
PyPI1 product
  • keystone≥ 10.0, < 16.0.2 | ≥ 17.0, < 17.0.1 | ≥ 18.0, < 18.0.1 | ≥ 19.0, < 19.0.1
Ubuntu1 product
  • keystoneAll versions (No fix recorded)

4 vendors · 4 products

References

14 links
Show all 14 references