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CVE-2024-56522

Estado: ModificadaAlta (7.5)—

An issue was discovered in TCPDF before 6.8.0. unserializeTCPDFtag uses != (aka loose comparison) and does not use a constant-time function to compare TCPDF tag hashes.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

TCPDF antes de 6.8.0: comparación débil de hashes en unserializeTCPDFtag permite falsificar tags remotamente (AV:N, PR:N), accediendo a datos sensibles en ficheros PDF procesados.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Tecnologías afectadas (1)

CWE

Referencias

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{
  "id": "CVE-2024-56522",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-56522",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-12-30T15:54:25.367571Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "tecnick",
          "product": "tcpdf",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "6.8.0",
              "versionType": "semver"
            }
          ],
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  ],
  "published": "2024-12-27T05:15:08.130",
  "references": [
    {
      "url": "https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89",
      "tags": [
        "Patch"
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      "source": "cve@mitre.org"
    },
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      "url": "https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0",
      "tags": [
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://tcpdf.org",
      "tags": [
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.php.net/manual/en/types.comparisons.php",
      "tags": [
        "Not Applicable"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-843"
        }
      ]
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  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in TCPDF before 6.8.0. unserializeTCPDFtag uses != (aka loose comparison) and does not use a constant-time function to compare TCPDF tag hashes."
    },
    {
      "lang": "es",
      "value": "Se descubrió un problema en TCPDF antes de 6.8.0. unserializeTCPDFtag usa != (también conocido como comparación flexible) y no usa una función de tiempo constante para comparar hashes de etiquetas TCPDF."
    }
  ],
  "lastModified": "2026-06-17T08:12:17.787",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "6.8.0"
            }
          ],
          "operator": "OR"
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      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}