CVE-2015-7546

Name: CVE-2015-7546
Creator: NVD / NIST
Published: 2016-02-03T18:59:04.853+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.71%

Last modified Jun 17, 2026

CVE-2015-7546 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.71%

74.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Openstack	Keystonemiddleware	>= 1.5.0, <= 1.5.3
Openstack	Keystonemiddleware	>= 1.6.0, <= 2.3.2
Openstack	Keystone	>= 8.0.0, < 8.0.2
Openstack	Keystone	>= 2015.1.0, <= 2015.1.2
Oracle	Solaris	11.3

References

http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
http://www.securityfocus.com/bid/80498Third Party Advisory, VDB Entry
https://bugs.launchpad.net/keystone/+bug/1490804Issue Tracking, Third Party Advisory
https://security.openstack.org/ossa/OSSA-2016-005.htmlPatch, Vendor Advisory
https://wiki.openstack.org/wiki/OSSN/OSSN-0062Vendor Advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
http://www.securityfocus.com/bid/80498Third Party Advisory, VDB Entry
https://bugs.launchpad.net/keystone/+bug/1490804Issue Tracking, Third Party Advisory
https://security.openstack.org/ossa/OSSA-2016-005.htmlPatch, Vendor Advisory
https://wiki.openstack.org/wiki/OSSN/OSSN-0062Vendor Advisory

Timeline

Published: Feb 3, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-7546?

How severe is CVE-2015-7546?

CVE-2015-7546 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.

How do I fix CVE-2015-7546?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-7546?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST