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CVE-2021-38185

Estado: ModificadaAlta (7.8)—

GNU cpio through 2.13 allows attackers to execute arbitrary code via a crafted pattern file, because of a dstring.c ds_fgetstr integer overflow that triggers an out-of-bounds heap write. NOTE: it is unclear whether there are common cases where the pattern file, associated with the -E option, is untrusted data.

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).

Tecnologías afectadas (1)

GNU — Cpio

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-38185",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-38185",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-06-09T15:10:43.041535Z"
        }
      }
    ],
    "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
      }
    ],
    "cvssMetricV31": [
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        "type": "Primary",
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          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
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          "userInteraction": "REQUIRED",
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          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.8
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        "cvssData": {
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          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
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        "exploitabilityScore": 1.8
      }
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  },
  "affected": [
    {
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      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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          ]
        }
      ]
    }
  ],
  "published": "2021-08-08T00:15:07.027",
  "references": [
    {
      "url": "https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=dd96882877721703e19272fe25034560b794061b",
      "tags": [
        "Patch",
        "Third Party Advisory"
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      "source": "cve@mitre.org"
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    {
      "url": "https://github.com/fangqyi/cpiopwn",
      "tags": [
        "Exploit",
        "Third Party Advisory"
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00007.html",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00000.html",
      "tags": [
        "Exploit",
        "Mailing List",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00002.html",
      "tags": [
        "Exploit",
        "Mailing List",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
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      "url": "https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=dd96882877721703e19272fe25034560b794061b",
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        "Third Party Advisory"
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      "url": "https://github.com/fangqyi/cpiopwn",
      "tags": [
        "Exploit",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00000.html",
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      "url": "https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00002.html",
      "tags": [
        "Exploit",
        "Mailing List",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "GNU cpio through 2.13 allows attackers to execute arbitrary code via a crafted pattern file, because of a dstring.c ds_fgetstr integer overflow that triggers an out-of-bounds heap write. NOTE: it is unclear whether there are common cases where the pattern file, associated with the -E option, is untrusted data."
    },
    {
      "lang": "es",
      "value": "GNU cpio versiones hasta 2.13, permite a atacantes ejecutar código arbitrario por medio de un archivo de patrones diseñado, debido a un desbordamiento de enteros en el archivo dstring.c en la función  ds_fgetstr que desencadena una escritura de pila fuera de límites. NOTA: no está claro si hay casos comunes en los que el archivo de patrones, asociado con la opción -E, son datos no confiables"
    }
  ],
  "lastModified": "2026-06-17T04:01:42.950",
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              "versionEndIncluding": "2.13"
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          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}