PYSEC-2026-686

Vulnerability from pysec - Published: 2026-07-02 14:13 - Updated: 2026-07-06 07:36
VLAI
Details

A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.

Severity
5.9 (Medium)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Impacted products
Name purl
neutron pkg:pypi/neutron
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "neutron",
        "purl": "pkg:pypi/neutron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.2.0-12.1"
            },
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.3.0-11.1"
            },
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.3.1-2.1"
            },
            {
              "introduced": "10.0.0"
            },
            {
              "fixed": "10.0.2-1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "10.0.5",
        "10.0.6",
        "10.0.7",
        "11.0.3",
        "11.0.4",
        "11.0.5",
        "11.0.6",
        "11.0.7",
        "11.0.8",
        "12.0.0",
        "12.0.0.0b3",
        "12.0.0.0rc1",
        "12.0.0.0rc2",
        "12.0.1",
        "12.0.2",
        "12.0.3",
        "12.0.4",
        "12.0.5",
        "12.0.6",
        "12.1.0",
        "12.1.1",
        "13.0.0",
        "13.0.0.0b1",
        "13.0.0.0b2",
        "13.0.0.0b3",
        "13.0.0.0rc1",
        "13.0.0.0rc2",
        "13.0.1",
        "13.0.2",
        "13.0.3",
        "13.0.4",
        "13.0.5",
        "13.0.6",
        "13.0.7",
        "14.0.0",
        "14.0.0.0b1",
        "14.0.0.0b2",
        "14.0.0.0b3",
        "14.0.0.0rc1",
        "14.0.1",
        "14.0.2",
        "14.0.3",
        "14.0.4",
        "14.1.0",
        "14.2.0",
        "14.3.0",
        "14.3.1",
        "14.4.0",
        "14.4.1",
        "14.4.2",
        "15.0.0",
        "15.0.0.0b1",
        "15.0.0.0rc1",
        "15.0.0.0rc2",
        "15.0.1",
        "15.0.2",
        "15.1.0",
        "15.2.0",
        "15.3.0",
        "15.3.1",
        "15.3.2",
        "15.3.3",
        "15.3.4",
        "16.0.0",
        "16.0.0.0b1",
        "16.0.0.0rc1",
        "16.0.0.0rc2",
        "16.1.0",
        "16.2.0",
        "16.3.0",
        "16.3.1",
        "16.3.2",
        "16.4.0",
        "16.4.1",
        "16.4.2",
        "17.0.0",
        "17.0.0.0rc1",
        "17.0.0.0rc2",
        "17.1.0",
        "17.1.1",
        "17.1.2",
        "17.2.0",
        "17.2.1",
        "17.3.0",
        "17.4.0",
        "17.4.1",
        "18.0.0",
        "18.0.0.0rc1",
        "18.0.0.0rc2",
        "18.1.0",
        "18.1.1",
        "18.2.0",
        "18.3.0",
        "18.4.0",
        "18.5.0",
        "18.6.0",
        "19.0.0",
        "19.0.0.0rc1",
        "19.0.0.0rc2",
        "19.1.0",
        "19.2.0",
        "19.3.0",
        "19.4.0",
        "19.5.0",
        "19.6.0",
        "19.7.0",
        "20.0.0",
        "20.0.0.0rc1",
        "20.0.0.0rc2",
        "20.1.0",
        "20.2.0",
        "20.3.0",
        "20.3.1",
        "20.4.0",
        "20.5.0",
        "21.0.0",
        "21.0.0.0rc1",
        "21.0.0.0rc2",
        "21.1.0",
        "21.1.1",
        "21.1.2",
        "21.2.0",
        "21.2.1",
        "22.0.0",
        "22.0.0.0rc1",
        "22.0.0.0rc2",
        "22.0.1",
        "22.0.2",
        "22.1.0",
        "22.2.0",
        "22.2.1",
        "23.0.0",
        "23.0.0.0b1",
        "23.0.0.0b2",
        "23.0.0.0b3",
        "23.0.0.0rc1",
        "23.0.0.0rc2",
        "23.1.0",
        "23.2.0",
        "23.3.0",
        "23.4.0",
        "23.5.0",
        "24.0.0",
        "24.0.0.0b1",
        "24.0.0.0rc1",
        "24.0.0.0rc2",
        "24.0.1",
        "24.1.0",
        "24.2.0",
        "24.2.1",
        "24.2.2",
        "25.0.0",
        "25.0.0.0b1",
        "25.0.0.0rc1",
        "25.0.0.0rc2",
        "25.1.0",
        "25.2.0",
        "25.2.1",
        "25.2.2",
        "25.2.3",
        "26.0.0",
        "26.0.0.0b1",
        "26.0.0.0b2",
        "26.0.0.0rc1",
        "26.0.0.0rc2",
        "26.0.1",
        "26.0.2",
        "26.0.3",
        "26.0.4",
        "27.0.0",
        "27.0.0.0b1",
        "27.0.0.0rc1",
        "27.0.1",
        "27.0.2",
        "27.0.3",
        "28.0.0",
        "28.0.0.0b1",
        "28.0.0.0b2",
        "28.0.0.0rc1",
        "28.0.0.0rc2",
        "28.0.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2017-7543",
    "GHSA-hvxr-2fvv-c3wq"
  ],
  "details": "A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.",
  "id": "PYSEC-2026-686",
  "modified": "2026-07-06T07:36:56.973131Z",
  "published": "2026-07-02T14:13:22.484803Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-7543"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2447"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2448"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2449"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2450"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2451"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2017:2452"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2017-7543"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1473792"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543"
    },
    {
      "type": "PACKAGE",
      "url": "https://opendev.org/openstack/neutron"
    },
    {
      "type": "WEB",
      "url": "https://web.archive.org/web/20200227153412/https://www.securityfocus.com/bid/100237"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/neutron"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-hvxr-2fvv-c3wq"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenStack Neutron Race Condition vulnerability"
}



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