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CVE-2018-20251

Estado: ModificadaMedia (5.5)—

In WinRAR versions prior to and including 5.61, there is path traversal vulnerability when crafting the filename field of the ACE format. The UNACE module (UNACEV2.dll) creates files and folders as written in the filename field even when WinRAR validator noticed the traversal attempt and requestd to abort the extraction process. the operation is cancelled only after the folders and files were created but prior to them being written, therefore allowing the attacker to create empty files and folders everywhere in the file system.

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)

Rarlab — Winrar

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2018-20251",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
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          "scope": "UNCHANGED",
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          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@checkpoint.com",
      "affectedData": [
        {
          "vendor": "Check Point Software Technologies Ltd.",
          "product": "WinRAR",
          "versions": [
            {
              "status": "affected",
              "version": "All versions prior and including 5.61"
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-02-05T20:29:00.273",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/106948",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
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      "source": "cve@checkpoint.com"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://research.checkpoint.com/extracting-code-execution-from-winrar/",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cve@checkpoint.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-693"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In WinRAR versions prior to and including 5.61, there is path traversal vulnerability when crafting the filename field of the ACE format. The UNACE module (UNACEV2.dll) creates files and folders as written in the filename field even when WinRAR validator noticed the traversal attempt and requestd to abort the extraction process. the operation is cancelled only after the folders and files were created but prior to them being written, therefore allowing the attacker to create empty files and folders everywhere in the file system."
    },
    {
      "lang": "es",
      "value": "En WinRAR, en versiones anteriores e incluyendo a la 5.61, hay una vulnerabilidad de salto de directorio al manipular el campo \"filename\" del formato ACE. El módulo UNACE (UNACEV2.dll) crea archivos y carpetas tal y como están escritos en el campo \"filename\", incluso cuando el validador de WinRAR descubría el intento de salto y solicitaba abortar el proceso de extracción. La operación se cancelaba solo tras crear las carpetas y archivos, pero antes de que se escribiesen, permitiendo así que el atacante cree archivos y carpetas vacíos en cualquier lugar del sistema de archivos."
    }
  ],
  "lastModified": "2026-06-17T01:52:34.197",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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          "operator": "OR"
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  ],
  "sourceIdentifier": "cve@checkpoint.com"
}