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CVE-2020-35683

Estado: ModificadaAlta (7.5)—

An issue was discovered in HCC Nichestack 3.0. The code that parses ICMP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the ICMP checksum. When the IP payload size is set to be smaller than the size of the IP header, the ICMP checksum computation function may read out of bounds, causing a Denial-of-Service.

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)

Hcc-embedded — NichestackSiemens — 7km9300-0ae02-0aa0 Firmware

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-35683",
  "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": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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          ]
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  ],
  "published": "2021-08-19T12:15:07.353",
  "references": [
    {
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
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    {
      "url": "https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/",
      "tags": [
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      "url": "https://www.hcc-embedded.com",
      "tags": [
        "Product"
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.kb.cert.org/vuls/id/608209",
      "tags": [
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        "US Government Resource"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
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      "tags": [
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        "US Government Resource"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in HCC Nichestack 3.0. The code that parses ICMP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the ICMP checksum. When the IP payload size is set to be smaller than the size of the IP header, the ICMP checksum computation function may read out of bounds, causing a Denial-of-Service."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en HCC Nichestack versión 3.0. El código que analiza los paquetes ICMP se basa en un valor no comprobado del tamaño de la carga útil IP (extraído del encabezado IP) para calcular la suma de comprobación ICMP. Cuando el tamaño de la carga útil IP está configurado para ser más pequeño que el tamaño del encabezado IP, la función de cálculo de la suma de comprobación ICMP puede leer fuera de límites, causando una Denegación de Servicio."
    }
  ],
  "lastModified": "2026-06-17T03:14:07.533",
  "configurations": [
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  "sourceIdentifier": "cve@mitre.org"
}