Is CVE-2021-38155 in the CISA KEV catalog?

No. CVE-2021-38155 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-38155?

CVE-2021-38155 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-38155?

CVE-2021-38155 has an EPSS score of 2.46% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-38155?

Upgrade keystone on debian 11 to 2:18.0.0-3+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-38155

HIGHEPSS 83th pctl

7.5

CVSS v3

NVD

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.

CWE-307

How to fix

Remediation Available

keystoneDebian

Fixed in:2:18.0.0-3+deb11u1CVE-2021-38155

Fixed in:2:19.0.0-3CVE-2021-38155

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

2.46%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Patch3

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-307 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-17240	Critical	9.8	40%	-	-
CVE-2023-29301	High	7.5	32%	-	-
CVE-2023-22960	High	7.5	28%	-	Fix
CVE-2020-15906	Critical	9.8	27%	-	Fix
CVE-2016-9361	Critical	9.8	20%	-	-
CVE-2024-39225	Critical	9.8	15%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.