Is CVE-2015-7546 in the CISA KEV catalog?

No. CVE-2015-7546 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-7546?

CVE-2015-7546 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-7546?

CVE-2015-7546 has an EPSS score of 1.71% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-7546?

Upgrade keystone on debian 11 to 2:9.0.0~rc2-1 or later.

CVE & CISA-KEV Catalog

CVE-2015-7546

HIGHEPSS 75th pctl

7.5

CVSS v3

NVD

Description

The identity service in OpenStack Identity (Keystone) before 2015.1.3 (Kilo) and 8.0.x before 8.0.2 (Liberty) and keystonemiddleware (formerly python-keystoneclient) before 1.5.4 (Kilo) and Liberty before 2.3.3 does not properly invalidate authorization tokens when using the PKI or PKIZ token providers, which allows remote authenticated users to bypass intended access restrictions and gain access to cloud resources by manipulating byte fields within a revoked token.

CWE-522

How to fix

Remediation Available

keystoneDebian

Fixed in:2:9.0.0~rc2-1CVE-2015-7546

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 ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.71%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Patch1

security.openstack.org

Vendor Advisory1

wiki.openstack.org

Third-Party Advisory3

Related Vulnerabilities

Other CWE-522 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-17662	Critical	9.8	97%	-	-
CVE-2020-29583	Critical	9.8	90%	KEV	-
CVE-2021-30116	Critical	10.0	86%	KEV + Ransom	Fix
CVE-2024-44000	Critical	9.8	83%	-	Fix
CVE-2018-9160	Critical	9.8	77%	-	-
CVE-2017-9248	Critical	9.8	75%	KEV	Fix

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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 2026-05-06.