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CVE-2020-1919

Estado: ModificadaAlta (7.5)—

Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument passed in is longer than the first. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.

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)

Facebook — Hhvm

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-1919",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "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-assign@fb.com",
      "affectedData": [
        {
          "vendor": "Facebook",
          "product": "HHVM",
          "versions": [
            {
              "status": "unaffected",
              "version": "4.98.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.98.0"
            },
            {
              "status": "unaffected",
              "version": "4.97.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.97.0"
            },
            {
              "status": "unaffected",
              "version": "4.96.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.96.0"
            },
            {
              "status": "unaffected",
              "version": "4.95.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.95.0"
            },
            {
              "status": "unaffected",
              "version": "4.94.1",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.94.0"
            },
            {
              "status": "unaffected",
              "version": "4.93.2",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.81.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "4.80.2",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "4.57.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "4.56.3",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "4.56.3",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-03-10T16:15:14.470",
  "references": [
    {
      "url": "https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "cve-assign@fb.com"
    },
    {
      "url": "https://hhvm.com/blog/2021/02/25/security-update.html",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "cve-assign@fb.com"
    },
    {
      "url": "https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://hhvm.com/blog/2021/02/25/security-update.html",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cve-assign@fb.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument passed in is longer than the first. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0."
    },
    {
      "lang": "es",
      "value": "Unos cálculos de límites incorrectos en la función substr_compare podrían conllevar a una lectura fuera de límites cuando el segundo argumento de cadena pasado es más largo que el primero. Este problema afecta a HHVM versiones anteriores a 4.56.3, todas las versiones entre 4.57.0 y 4.80.1, todas las versiones entre 4.81.0 y 4.93.1 y las versiones 4.94.0, 4.95.0, 4.96.0, 4.97.0 , 4.98.0"
    }
  ],
  "lastModified": "2026-06-17T03:02:36.913",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "4.56.3"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "59DAD37C-9F51-4BE3-B045-537CA259F7F7",
              "versionEndExcluding": "4.80.2",
              "versionStartIncluding": "4.57.0"
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              "matchCriteriaId": "3B78720F-AA79-459F-A66C-5C4D67D7EE31",
              "versionEndExcluding": "4.93.2",
              "versionStartIncluding": "4.81.0"
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              "criteria": "cpe:2.3:a:facebook:hhvm:4.94.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1C4B9A3C-6A5A-45C4-A490-C13CF6D6A867"
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              "matchCriteriaId": "18D33DC0-E6A7-4DC6-8E9A-2B85842EC21B"
            },
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              "matchCriteriaId": "B0B9078D-3C25-45B2-B5F2-59585A47BACB"
            },
            {
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              "matchCriteriaId": "7B8F5C11-8610-4099-8A45-E6241F3D24E0"
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              "vulnerable": true,
              "matchCriteriaId": "47FF13C3-19DC-4F53-BF9D-38AC89D647D5"
            }
          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "cve-assign@fb.com"
}