CVE-2021-38155

HIGH

7.5

CVSS Score

Published: August 6, 2021 at 12:00 AM UTC

Updated: June 17, 2026 at 04:01 AM UTC

1 product affected across 1 vendorKeystone

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Severity

HIGH7.5

Exploit prediction

EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Keystone · Openstack

95%

10.0.0 ≤ v < 16.0.217.0.0 ≤ v < 17.0.118.0.0 ≤ v < 18.0.119.0.0 ≤ v < 19.0.1

Affected range stops below 16.0.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.0.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.0.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Mailing ListPatchThird Party Advisory

Source: [email protected]

http://www.openwall.com/lists/oss-security/2021/08/10/5

ExploitIssue TrackingPatchThird Party Advisory

Source: [email protected]

https://launchpad.net/bugs/1688137

Mailing List

Source: [email protected]

https://lists.debian.org/debian-lts-announce/2024/01/msg00007.html

PatchVendor Advisory

Source: [email protected]

https://security.openstack.org/ossa/OSSA-2021-003.html

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-307

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