CVE-2015-7546

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.

Published: 2016-02-03 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-7546 is rated Low Risk (39.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2015-7546

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-07-13 0.85% 0.10% -0.74%
2 2025-03-30 2.81% 0.85% -1.96%
3 2025-03-29 — 2.81% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-7546

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 5.9 [email protected]
6.0 2.0 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.8 6.4 [email protected]

Weakness enumeration for CVE-2015-7546

GitHub Security Advisory for CVE-2015-7546

GHSA-8c4w-v65p-jvcv · Severity: high · Ecosystem: pip — OpenStack Identity Keystone and keystonemiddleware Insufficiently Protected Credentials

OS Trackers for CVE-2015-7546

vendor priority summary link
debian not yet assigned CVE-2015-7546 not yet assigned priority: Debian including 2 source packages (keystone, python-keystonemiddleware), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2015-7546
redhat medium — https://access.redhat.com/security/cve/CVE-2015-7546
suse medium CVE-2015-7546 severity moderate: SUSE including 2 source package names (crowbar-openstack-3.0+git.1456169766.1e60d19-1.1, openstack-keystone), 2 product×package rows across 2 product lines (SUSE Cloud 5, SUSE OpenStack Cloud 6): Fixed 1, Known Not Affected 1. https://www.suse.com/security/cve/CVE-2015-7546/
ubuntu medium CVE-2015-7546 medium priority: Ubuntu including 2 source packages (keystone, python-keystonemiddleware), 16 status rows across 8 suites (precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): not-affected 7, ignored 4, DNE 3, needs-triage 2. https://ubuntu.com/security/CVE-2015-7546

Affected software / configurations for CVE-2015-7546

Vendor Product Version Raw CPE
openstack keystonemiddleware >= 1.5.0, <= 1.5.3 cpe:2.3:a:openstack:keystonemiddleware:*:*:*:*:*:*:*:*
openstack keystonemiddleware >= 1.6.0, <= 2.3.2 cpe:2.3:a:openstack:keystonemiddleware:*:*:*:*:*:*:*:*
openstack keystone >= 8.0.0, < 8.0.2 cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*
openstack keystone >= 2015.1.0, <= 2015.1.2 cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*
oracle solaris 11.3 cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*

References for CVE-2015-7546

cvelogic Threat Intelligence