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CVE-2021-31401

Estado: ModificadaAlta (7.5)—

An issue was discovered in tcp_rcv() in nptcp.c in HCC embedded InterNiche 4.0.1. The TCP header processing code doesn't sanitize the value of the IP total length field (header length + data length). With a crafted IP packet, an integer overflow occurs whenever the value of the IP data length is calculated by subtracting the length of the header from the total length of the IP packet.

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)

Hcc-embedded — NichestackSiemens — Sentron 3WA Com190 FirmwareSiemens — Sentron 3WL Com35 Firmware

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-31401",
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        "source": "nvd@nist.gov",
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          "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"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "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"
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        "impactScore": 3.6,
        "exploitabilityScore": 3.9
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  "affected": [
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      "affectedData": [
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          "vendor": "n/a",
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          "versions": [
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  "published": "2021-08-19T12:15:08.893",
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  "vulnStatus": "Modified",
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      "description": [
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          "value": "CWE-20"
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      "value": "An issue was discovered in tcp_rcv() in nptcp.c in HCC embedded InterNiche 4.0.1. The TCP header processing code doesn't sanitize the value of the IP total length field (header length + data length). With a crafted IP packet, an integer overflow occurs whenever the value of the IP data length is calculated by subtracting the length of the header from the total length of the IP packet."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en la función tcp_rcv() en el archivo nptcp.c en HCC embedded InterNiche versión 4.0.1. El código de procesamiento del encabezado TCP no sanea el valor del campo de longitud total de IP (longitud del encabezado + longitud de los datos). Con un paquete IP diseñado, se produce un desbordamiento de enteros cuando el valor de la longitud de datos IP se calcula restando la longitud del encabezado de la longitud total del paquete IP."
    }
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  "lastModified": "2026-06-17T03:51:42.607",
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