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CVE-2021-20267

Estado: ModificadaAlta (7.1)—

A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Openstack — NeutronRedhat — Openstack Platform

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-20267",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 5.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "baseScore": 7.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
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        "impactScore": 4.2,
        "exploitabilityScore": 2.8
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  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "openstack-neutron",
          "versions": [
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              "status": "affected",
              "version": "openstack-neutron 15.3.3, openstack-neutron 16.3.1, openstack-neutron 17.1.1"
            }
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  "published": "2021-05-28T19:15:07.483",
  "references": [
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1934330",
      "tags": [
        "Issue Tracking",
        "Patch",
        "Third Party Advisory"
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      "source": "secalert@redhat.com"
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    {
      "url": "https://security.openstack.org/ossa/OSSA-2021-001.html",
      "tags": [
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        "Vendor Advisory"
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      "source": "secalert@redhat.com"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected."
    },
    {
      "lang": "es",
      "value": "Se encontró un fallo en las reglas de firewall predeterminadas de Open vSwitch de openstack-neutron. Mediante el envío de paquetes cuidadosamente diseñados, cualquier persona que tenga el control de una instancia de servidor conectada al switch virtual puede hacerse pasar por las direcciones IPv6 de otros sistemas en la red, resultando en una denegación de servicio o, en algunos casos, posiblemente en la interceptación del tráfico destinado a otros destinos. Solo están afectadas las implementaciones que usan el controlador Open vSwitch. Fuente: OpenStack project. Las versiones anteriores a openstack-neutron 15.3.3, openstack-neutron versión 16.3.1 y openstack-neutron versión 17.1.1 están afectadas"
    }
  ],
  "lastModified": "2026-06-17T03:33:34.500",
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