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CVE-2021-20294

Estado: ModificadaAlta (7.8)—💥 PoC

A flaw was found in binutils readelf 2.35 program. An attacker who is able to convince a victim using readelf to read a crafted file could trigger a stack buffer overflow, out-of-bounds write of arbitrary data supplied by the attacker. The highest impact of this flaw is to confidentiality, integrity, and availability.

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

Tecnologías afectadas (1)

GNU — Binutils

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-20294",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
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    "cvssMetricV31": [
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          "version": "3.1",
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          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "binutils",
          "versions": [
            {
              "status": "affected",
              "version": "binutils 2.35.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-04-29T16:15:09.783",
  "references": [
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1943533",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
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      "source": "secalert@redhat.com"
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      "source": "secalert@redhat.com"
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      "tags": [
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    {
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        "Issue Tracking",
        "Patch",
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      "source": "secalert@redhat.com"
    },
    {
      "url": "https://sourceware.org/git/?p=binutils-gdb.git%3Ba=patch%3Bh=372dd157272e0674d13372655cc60eaca9c06926",
      "source": "secalert@redhat.com"
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      "tags": [
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      "tags": [
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        "Issue Tracking",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in binutils readelf 2.35 program. An attacker who is able to convince a victim using readelf to read a crafted file could trigger a stack buffer overflow, out-of-bounds write of arbitrary data supplied by the attacker. The highest impact of this flaw is to confidentiality, integrity, and availability."
    },
    {
      "lang": "es",
      "value": "Se encontró un fallo en el programa binutils readelf versión 2.35. Un atacante que sea capaz de convencer a una víctima usando readelf para que lea un archivo diseñado podría desencadenar un desbordamiento de búfer de la pila, una escritura fuera de límites de los datos arbitrarios proporcionados por el atacante. El mayor impacto de este fallo es la confidencialidad, integridad y disponibilidad"
    }
  ],
  "lastModified": "2026-06-17T03:33:37.357",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:gnu:binutils:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A775487B-2BF9-4578-B557-E77278DA5F94",
              "versionEndExcluding": "2.35.2",
              "versionStartIncluding": "2.35"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secalert@redhat.com"
}