CVE-2025-66038

{
  "id": "CVE-2025-66038",
  "cveTags": [],
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          "id": "CVE-2025-66038",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-01T18:15:18.318069Z"
        }
      }
    ],
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      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 3.9,
          "attackVector": "PHYSICAL",
          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 0.5
      },
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 6.8,
          "attackVector": "PHYSICAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 0.9
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  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "OpenSC",
          "product": "OpenSC",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.27.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-03-30T18:16:18.177",
  "references": [
    {
      "url": "https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-126"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0."
    },
    {
      "lang": "es",
      "value": "OpenSC es un conjunto de herramientas y middleware de código abierto para tarjetas inteligentes. Antes de la versión 0.27.0, sc_compacttlv_find_tag busca una etiqueta dada en un búfer compact-TLV. En compact-TLV, un solo byte codifica la etiqueta (nibble superior) y la longitud del valor (nibble inferior). Con un búfer de 1 byte {0x0A}, el elemento codificado declara etiqueta=0 y longitud=10 pero no le siguen bytes de valor. Llamar a sc_compacttlv_find_tag con la etiqueta de búsqueda 0x00 devuelve un puntero igual a buf+1 y outlen=10 sin verificar que la longitud de valor declarada cabe dentro del búfer restante. En los casos en que a sc_compacttlv_find_tag se le proporcionan datos no confiables (como los leídos de tarjetas/archivos), los atacantes pueden influir en ella para que devuelva punteros fuera de los límites, lo que lleva a una corrupción de memoria posterior cuando el código subsiguiente intenta desreferenciar el puntero. Este problema ha sido corregido en la versión 0.27.0."
    }
  ],
  "lastModified": "2026-06-17T09:56:13.423",
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