CVE-2015-5240

Race condition in OpenStack Neutron before 2014.2.4 and 2015.1 before 2015.1.2, when using the ML2 plugin or the security groups AMQP API, allows remote authenticated users to bypass IP anti-spoofing controls by changing the device owner of a port to start with network: before the security group rules are applied.

Published: 2015-10-27 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-5240 is rated Low Risk (34.7/100): CVSS Low severity, with medium exploitation likelihood (EPSS 0.96%). 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-2015-5240

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 2026-06-15 0.17% 0.96% +0.79%
2 2026-06-05 0.09% 0.17% +0.08%
3 2025-03-30 — 0.09% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-5240

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.5 2.0 LOW
AV:N/AC:M/Au:S/C:N/I:P/A:N 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:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 6.8 2.9 [email protected]

Weakness enumeration for CVE-2015-5240

GitHub Security Advisory for CVE-2015-5240

GHSA-hhpj-6pj7-wpx5 · Severity: low · Ecosystem: pip — OpenStack Neutron Race condition vulnerability

OS Trackers for CVE-2015-5240

vendor priority summary link
debian not yet assigned CVE-2015-5240 not yet assigned priority: Debian including 1 source packages (neutron), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2015-5240
redhat medium — https://access.redhat.com/security/cve/CVE-2015-5240
ubuntu medium CVE-2015-5240 medium priority: Ubuntu including 1 source packages (neutron), 5 status rows across 5 suites (precise, trusty, upstream, vivid, wily): DNE 2, not-affected 2, needs-triage 1. https://ubuntu.com/security/CVE-2015-5240

Affected software / configurations for CVE-2015-5240

Vendor Product Version Raw CPE
openstack neutron 2014.2.3 cpe:2.3:a:openstack:neutron:2014.2.3:*:*:*:*:*:*:*
openstack neutron 2015.1.0 cpe:2.3:a:openstack:neutron:2015.1.0:*:*:*:*:*:*:*
openstack neutron 2015.1.1 cpe:2.3:a:openstack:neutron:2015.1.1:*:*:*:*:*:*:*

References for CVE-2015-5240

cvelogic Threat Intelligence