CVE-2016-5362: Neutron OpenStack Neutron Allows Remote Attackers Vulnerability

HIGH
Advisory Identifier: GHSA-qpwc-p365-pqrr
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CVSS 8.2
CWE-923
Published
Advisory Summary

CVE-2016-5362 is a HIGH (CVSS 8.2) openstack neutron allows remote attackers vulnerability (CWE-923: Improper Restriction of Communication Channel to Intended Endpoints) affecting Neutron libraries in the PyPI ecosystem. The issue involves openstack neutron allows remote attackers to bypass an intended dhcp-spoofing protection mechanism. Remediation is available by upgrading affected packages to version 7.0.5, 8.1.1.

CVE-2016-5362 at a Glance

CVE Identifier CVE-2016-5362
GHSA Identifier GHSA-qpwc-p365-pqrr
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification CWE-923: Improper Restriction of Communication Channel to Intended Endpoints
Affected Product Neutron
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.2

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2016-5362

To remediate this vulnerability, upgrade all affected Neutron dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

neutron fixed: 7.0.5 
pip install neutron>=7.0.5
neutron fixed: 8.1.1 
pip install neutron>=8.1.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show neutron

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2016-5362, inspect your installed packages using pip:

pip show neutron

Analyze the terminal output to locate any version of Neutron in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.0.5), your application is affected.

Note: The pip show neutron command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-923: Improper Restriction of Communication Channel to Intended Endpoints, where the product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint. In Neutron, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended DHCP-spoofing protection mechanism and consequently cause a denial of service or intercept network traffic via a crafted DHCP discovery message.

CVE-2016-5362 Affected Neutron Versions

2 component(s)
Fixed Versions:
7.0.58.1.1
Product / Package Ecosystem Affected Versions Fixed Version
neutron
pypi/neutron
PyPI
< 7.0.5
7.0.5
neutron
pypi/neutron
PyPI
≥ 8.0.0
< 8.1.1
8.1.1

References

NVD — CVE-2016-5362 NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-5362
access.redhat.com/errata/rhsa-2016:14... WEB
https://access.redhat.com/errata/RHSA-2016:1473
access.redhat.com/errata/rhsa-2016:14... WEB
https://access.redhat.com/errata/RHSA-2016:1474
bugs.launchpad.net/neutron/+bug/155865... WEB
https://bugs.launchpad.net/neutron/+bug/1558658
Neutron Source Repository REPOSITORY
https://github.com/openstack/neutron
review.openstack.org/ WEB
https://review.openstack.org/#/c/300202
review.openstack.org/ WEB
https://review.openstack.org/#/c/303563
review.openstack.org/ WEB
https://review.openstack.org/#/c/303572
Neutron Security Information SECURITY
https://security.openstack.org/ossa/OSSA-2016-009.html
Neutron Security Information SECURITY
http://www.openwall.com/lists/oss-security/2016/06/10/5
Neutron Security Information SECURITY
http://www.openwall.com/lists/oss-security/2016/06/10/6

Frequently Asked Questions

What is CVE-2016-5362?
CVE-2016-5362 is a security vulnerability in Neutron involving OpenStack Neutron allows remote attackers to bypass an intended DHCP-spoofing protection mechanism under CWE-923: Improper Restriction of Communication Channel to Intended Endpoints.
Which Neutron versions are affected?
Affected versions include releases prior to 7.0.5, 8.1.1 across affected packages: neutron.
What version fixes CVE-2016-5362?
Upgrading to 7.0.5, 8.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is neutron affected?
Yes, neutron is affected in releases prior to 7.0.5, 8.1.1. Upgrade your dependency to 7.0.5, 8.1.1 or later.
What is the CVSS score of CVE-2016-5362?
CVE-2016-5362 has a CVSS v3.1 base score of 8.2 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.
What CWE is associated with CVE-2016-5362?
CVE-2016-5362 is classified under CWE-923: Improper Restriction of Communication Channel to Intended Endpoints (The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint.).
How can I check PyPI dependencies for CVE-2016-5362?
Run the dependency tree command: 'pip show neutron'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-qpwc-p365-pqrr",
  "modified" : "2025-04-14T21:05:49Z",
  "published" : "2022-05-14T02:19:49Z",
  "aliases" : [ "CVE-2016-5362" ],
  "summary" : "OpenStack Neutron allows remote attackers to bypass an intended DHCP-spoofing protection mechanism",
  "details" : "The IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended DHCP-spoofing protection mechanism and consequently cause a denial of service or intercept network traffic via a crafted DHCP discovery message.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "neutron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "7.0.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "neutron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2016-5362"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2016:1473"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2016:1474"
  }, {
    "type" : "WEB",
    "url" : "https://bugs.launchpad.net/neutron/+bug/1558658"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openstack/neutron"
  }, {
    "type" : "WEB",
    "url" : "https://review.openstack.org/#/c/300202"
  }, {
    "type" : "WEB",
    "url" : "https://review.openstack.org/#/c/303563"
  }, {
    "type" : "WEB",
    "url" : "https://review.openstack.org/#/c/303572"
  }, {
    "type" : "WEB",
    "url" : "https://security.openstack.org/ossa/OSSA-2016-009.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2016/06/10/5"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2016/06/10/6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-923" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-04-14T20:58:57Z",
    "nvd_published_at" : "2016-06-17T15:59:00Z"
  }
}