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FKIE_CVE-2026-20033

Vulnerability from fkie_nvd - Published: 2026-02-25 17:25 - Updated: 2026-06-17 10:16
Severity
7.4 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Summary
A vulnerability in Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation when processing specific Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to the management interface of an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. Note: Only the out-of-band (OOB) management interface is affected.
References
psirt@cisco.comhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cpdos-qLsv6pFD
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "Cisco NX-OS System Software in ACI Mode",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "15.2(1g)"
            },
            {
              "status": "affected",
              "version": "15.2(2e)"
            },
            {
              "status": "affected",
              "version": "15.2(2f)"
            },
            {
              "status": "affected",
              "version": "15.2(2g)"
            },
            {
              "status": "affected",
              "version": "15.2(2h)"
            },
            {
              "status": "affected",
              "version": "15.2(3f)"
            },
            {
              "status": "affected",
              "version": "15.2(3e)"
            },
            {
              "status": "affected",
              "version": "15.2(3g)"
            },
            {
              "status": "affected",
              "version": "15.2(4d)"
            },
            {
              "status": "affected",
              "version": "15.2(4e)"
            },
            {
              "status": "affected",
              "version": "15.2(5c)"
            },
            {
              "status": "affected",
              "version": "15.2(5d)"
            },
            {
              "status": "affected",
              "version": "16.0(1g)"
            },
            {
              "status": "affected",
              "version": "15.2(5e)"
            },
            {
              "status": "affected",
              "version": "15.2(4f)"
            },
            {
              "status": "affected",
              "version": "15.2(6e)"
            },
            {
              "status": "affected",
              "version": "15.2(6h)"
            },
            {
              "status": "affected",
              "version": "16.0(1j)"
            },
            {
              "status": "affected",
              "version": "15.2(6g)"
            },
            {
              "status": "affected",
              "version": "15.2(7f)"
            },
            {
              "status": "affected",
              "version": "15.2(7g)"
            },
            {
              "status": "affected",
              "version": "16.0(2h)"
            },
            {
              "status": "affected",
              "version": "15.2(8d)"
            },
            {
              "status": "affected",
              "version": "16.0(2j)"
            },
            {
              "status": "affected",
              "version": "15.2(8e)"
            },
            {
              "status": "affected",
              "version": "16.0(3d)"
            },
            {
              "status": "affected",
              "version": "16.0(3e)"
            },
            {
              "status": "affected",
              "version": "15.2(8f)"
            },
            {
              "status": "affected",
              "version": "15.2(8g)"
            },
            {
              "status": "affected",
              "version": "15.3(1d)"
            },
            {
              "status": "affected",
              "version": "15.2(8h)"
            },
            {
              "status": "affected",
              "version": "16.0(4c)"
            },
            {
              "status": "affected",
              "version": "15.3(2a)"
            },
            {
              "status": "affected",
              "version": "15.2(8i)"
            },
            {
              "status": "affected",
              "version": "16.0(5h)"
            },
            {
              "status": "affected",
              "version": "15.3(2b)"
            },
            {
              "status": "affected",
              "version": "16.0(3g)"
            },
            {
              "status": "affected",
              "version": "16.0(5j)"
            },
            {
              "status": "affected",
              "version": "15.3(2c)"
            },
            {
              "status": "affected",
              "version": "16.0(6c)"
            },
            {
              "status": "affected",
              "version": "15.3(2d)"
            },
            {
              "status": "affected",
              "version": "16.1(1f)"
            },
            {
              "status": "affected",
              "version": "16.0(7e)"
            },
            {
              "status": "affected",
              "version": "16.0(8e)"
            },
            {
              "status": "affected",
              "version": "15.3(2e)"
            },
            {
              "status": "affected",
              "version": "16.0(8f)"
            },
            {
              "status": "affected",
              "version": "16.1(2f)"
            },
            {
              "status": "affected",
              "version": "16.1(2g)"
            },
            {
              "status": "affected",
              "version": "15.3(2f)"
            },
            {
              "status": "affected",
              "version": "16.0(9c)"
            },
            {
              "status": "affected",
              "version": "16.1(3f)"
            },
            {
              "status": "affected",
              "version": "16.0(9d)"
            },
            {
              "status": "affected",
              "version": "16.0(6h)"
            },
            {
              "status": "affected",
              "version": "16.0(8h)"
            },
            {
              "status": "affected",
              "version": "16.1(3g)"
            },
            {
              "status": "affected",
              "version": "16.0(9e)"
            },
            {
              "status": "affected",
              "version": "16.1(4h)"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to insufficient validation when processing specific Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to the\u0026nbsp;management interface of an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.\r\nNote: Only the out-of-band (OOB) management interface is affected."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en los switches de tejido Cisco Nexus serie 9000 en modo ACI podr\u00eda permitir a un atacante adyacente no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a una validaci\u00f3n insuficiente al procesar tramas Ethernet espec\u00edficas. Un atacante podr\u00eda explotar esta vulnerabilidad al enviar una trama Ethernet manipulada a la interfaz de gesti\u00f3n de un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante hacer que el dispositivo se recargue inesperadamente, lo que resultar\u00eda en una condici\u00f3n de DoS.\nNota: Solo la interfaz de gesti\u00f3n fuera de banda (OOB) se ve afectada."
    }
  ],
  "id": "CVE-2026-20033",
  "lastModified": "2026-06-17T10:16:56.763",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.0,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-20033",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-25T18:18:01.739135Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-25T17:25:24.560",
  "references": [
    {
      "source": "psirt@cisco.com",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cpdos-qLsv6pFD"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-805"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    }
  ]
}



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