{
  "id": "CVE-2020-12886",
  "sourceIdentifier": "cve@mitre.org",
  "published": "2020-06-18T19:15:11.567",
  "lastModified": "2020-06-25T14:31:37.100",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP packet header starting from the message token. The length of the token in the received message is provided in the first byte parsed by the sn_coap_parser_options_parse() function. The length encoded in the message is not validated against the actual input buffer length before accessing the token. As a result, memory access outside of the intended boundary of the buffer may occur."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 una lectura excesiva del b\u00fafer en la biblioteca CoAP en Arm Mbed OS versi\u00f3n 5.15.3. El analizador CoAP es responsable de analizar los paquetes CoAP recibidos. La funci\u00f3n sn_coap_parser_options_parse() analiza el encabezado del paquete CoAP a partir del token del mensaje. La longitud del token en el mensaje recibido es proporcionado en el primer byte analizado por la funci\u00f3n sn_coap_parser_options_parse(). La longitud codificada en el mensaje no es validada contra la longitud real del b\u00fafer de entrada antes de acceder al token. Como resultado, un acceso a la memoria fuera del l\u00edmite previsto del b\u00fafer puede producirse"
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ],
    "cvssMetricV2": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "2.0",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "accessVector": "NETWORK",
          "accessComplexity": "LOW",
          "authentication": "NONE",
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.4
        },
        "baseSeverity": "MEDIUM",
        "exploitabilityScore": 10.0,
        "impactScore": 4.9,
        "acInsufInfo": false,
        "obtainAllPrivilege": false,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*",
              "matchCriteriaId": "B314FCEF-12B7-4510-AC5E-12D3574E3E68"
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  "references": [
    {
      "url": "https://github.com/ARMmbed/mbed-coap/pull/116",
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/ARMmbed/mbed-os/issues/12948",
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
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    }
  ]
}