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CVE-2019-17210

Estado: ModificadaAlta (7.5)—

A denial-of-service issue was discovered in the MQTT library in Arm Mbed OS 2017-11-02. The function readMQTTLenString() is called by the function MQTTDeserialize_publish() to get the length and content of the MQTT topic name. In the function readMQTTLenString(), mqttstring->lenstring.len is a part of user input, which can be manipulated. An attacker can simply change it to a larger value to invalidate the if statement so that the statements inside the if statement are skipped, letting the value of mqttstring->lenstring.data default to zero.

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Later, curn is accessed, which points to mqttstring->lenstring.data. On an Arm Cortex-M chip, the value at address 0x0 is actually the initialization value for the MSP register. It is highly dependent on the actual firmware. Therefore, the behavior of the program is unpredictable from this time on.

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)

ARM — Mbed-mqttARM — Mbed-os

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-17210",
  "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"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "scope": "UNCHANGED",
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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": "2019-11-04T20:15:10.027",
  "references": [
    {
      "url": "https://github.com/ARMmbed/mbed-os/issues/11802",
      "tags": [
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        "Third Party Advisory"
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      "source": "cve@mitre.org"
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-20"
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  "descriptions": [
    {
      "lang": "en",
      "value": "A denial-of-service issue was discovered in the MQTT library in Arm Mbed OS 2017-11-02. The function readMQTTLenString() is called by the function MQTTDeserialize_publish() to get the length and content of the MQTT topic name. In the function readMQTTLenString(), mqttstring->lenstring.len is a part of user input, which can be manipulated. An attacker can simply change it to a larger value to invalidate the if statement so that the statements inside the if statement are skipped, letting the value of mqttstring->lenstring.data default to zero. Later, curn is accessed, which points to mqttstring->lenstring.data. On an Arm Cortex-M chip, the value at address 0x0 is actually the initialization value for the MSP register. It is highly dependent on the actual firmware. Therefore, the behavior of the program is unpredictable from this time on."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema de denegación de servicio en la biblioteca MQTT en Arm Mbed OS en 02-11-2017. La función MQTTDeserialize_publish() es llamada por la función readMQTTLenString() para conseguir la longitud y el contenido del nombre del tema MQTT. En la función readMQTTLenString(), mqttstring-)lenstring.len es una parte de la entrada del usuario, que puede ser manipulada. Un atacante puede simplemente cambiarlo a un valor mas grande para invalidar la sentencia if de manera que las sentencias dentro de la sentencia if sean omitidas, dejando el valor de mqttstring-)lenstring.data predeterminado en cero. Más tarde, curn es accedida, la cual apunta a mqttstring-)lenstring.data. En un chip DE Arm Cortex-M, el valor en la dirección 0x0 es realmente el valor de inicialización para el registro MSP. Este es muy dependiente del firmware actual. Por lo tanto, el comportamiento del programa es impredecible desde este momento."
    }
  ],
  "lastModified": "2026-06-17T02:23:28.540",
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