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CVE-2021-20596

Estado: ModificadaAlta (7.5)—

NULL Pointer Dereference in MELSEC-F Series FX3U-ENET firmware version 1.14 and prior, FX3U-ENET-L firmware version 1.14 and prior and FX3U-ENET-P502 firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a DoS condition in communication by sending specially crafted packets. Control by MELSEC-F series PLC is not affected and system reset is required for recovery.

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 (3)

Mitsubishielectric — Fx3u-enet-l FirmwareMitsubishielectric — Fx3u-enet-p502 FirmwareMitsubishielectric — Fx3u-enet Firmware

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-20596",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502",
          "versions": [
            {
              "status": "affected",
              "version": "Firmware version 1.14 and prior"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-07-22T12:15:07.787",
  "references": [
    {
      "url": "https://jvn.jp/vu/JVNVU94348759/index.html",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp"
    },
    {
      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp"
    },
    {
      "url": "https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp"
    },
    {
      "url": "https://jvn.jp/vu/JVNVU94348759/index.html",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-201-01",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-006_en.pdf",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "NULL Pointer Dereference in MELSEC-F Series FX3U-ENET firmware version 1.14 and prior, FX3U-ENET-L firmware version 1.14 and prior and FX3U-ENET-P502 firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a DoS condition in communication by sending specially crafted packets. Control by MELSEC-F series PLC is not affected and system reset is required for recovery."
    },
    {
      "lang": "es",
      "value": "Una desreferencia de puntero NULL en MELSEC-F Series FX3U-ENET versiones de firmware 1.14 y anteriores, FX3U-ENET-L versiones de firmware 1.14 y anteriores, y FX3U-ENET-P502 versiones de firmware 1.14 y anteriores, permite a un atacante remoto no autenticado causar una condición de Denegación de Servicio en la comunicación mediante el envío de paquetes especialmente diseñados. El control por parte del PLC de la serie MELSEC-F no está afectado y es requerido un reinicio del sistema para la recuperación"
    }
  ],
  "lastModified": "2026-06-17T03:34:05.433",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:mitsubishielectric:fx3u-enet-l_firmware:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C54E1F47-E0A3-4C49-A219-84175C7B8108",
              "versionEndIncluding": "1.14"
            },
            {
              "criteria": "cpe:2.3:o:mitsubishielectric:fx3u-enet-p502_firmware:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "72D73FF4-10B4-4F70-B603-27775A21B9F1",
              "versionEndIncluding": "1.14"
            },
            {
              "criteria": "cpe:2.3:o:mitsubishielectric:fx3u-enet_firmware:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BF1D75C8-9E0A-4A2A-A9B6-3A944721DFC4",
              "versionEndIncluding": "1.14"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp"
}