{
  "id": "CVE-2021-36647",
  "sourceIdentifier": "cve@mitre.org",
  "published": "2023-01-17T21:15:10.880",
  "lastModified": "2024-11-21T06:13:53.947",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Use of a Broken or Risky Cryptographic Algorithm in the function mbedtls_mpi_exp_mod() in lignum.c in Mbed TLS Mbed TLS all versions before 3.0.0, 2.27.0 or 2.16.11 allows attackers with access to precise enough timing and memory access information (typically an untrusted operating system attacking a secure enclave such as SGX or the TrustZone secure world) to recover the private keys used in RSA."
    },
    {
      "lang": "es",
      "value": "Uso de un algoritmo criptogr\u00e1fico roto o riesgoso en la funci\u00f3n mbedtls_mpi_exp_mod() en lignum.c en Mbed TLS Mbed TLS todas las versiones anteriores a 3.0.0, 2.27.0 o 2.16.11 permite a los atacantes acceder a informaci\u00f3n de tiempo y acceso a memoria suficientemente precisa (normalmente un sistema operativo que no es de confianza que ataca un enclave seguro como SGX o el mundo seguro TrustZone) para recuperar las claves privadas utilizadas en RSA."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-327"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "2.16.11",
              "matchCriteriaId": "E24E3CA8-CBFE-4C75-A3C0-1B0D8C3B694B"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "2.17.0",
              "versionEndExcluding": "2.27.0",
              "matchCriteriaId": "32B8405B-52A8-485A-85D2-D696626DBE19"
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              "vulnerable": true,
              "criteria": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "2.28.0",
              "versionEndExcluding": "3.0.0",
              "matchCriteriaId": "539125FA-10D5-41EF-B5D7-93B809231A33"
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          ]
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  ],
  "references": [
    {
      "url": "https://github.com/ARMmbed/mbedtls/releases/",
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://kouzili.com/Load-Step.pdf",
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1",
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/ARMmbed/mbedtls/releases/",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://kouzili.com/Load-Step.pdf",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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}