« Volver al listado

CVE-2020-1921

Estado: ModificadaAlta (7.5)—

In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the buffer. 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)

Mostrar
{
  "id": "CVE-2020-1921",
  "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:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "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:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "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": "2021-03-10T16:15:14.547",
  "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": [
        "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": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cve-assign@fb.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the buffer. 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": "En la función crypt, intentamos anular la finalización de un búfer usando el tamaño de la sal de entrada sin comprobar que el desplazamiento esté dentro del búfer. 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 versiones 4.94.0, 4.95.0, 4.96.0, 4.97.0 , 4.98.0"
    }
  ],
  "lastModified": "2026-06-17T03:02:37.127",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "069C0B7D-5233-4EFF-BBA7-8B84D9227044",
              "versionEndExcluding": "4.56.3"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "59DAD37C-9F51-4BE3-B045-537CA259F7F7",
              "versionEndExcluding": "4.80.2",
              "versionStartIncluding": "4.57.0"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3B78720F-AA79-459F-A66C-5C4D67D7EE31",
              "versionEndExcluding": "4.93.2",
              "versionStartIncluding": "4.81.0"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:4.94.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1C4B9A3C-6A5A-45C4-A490-C13CF6D6A867"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:4.95.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "18D33DC0-E6A7-4DC6-8E9A-2B85842EC21B"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:4.96.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B0B9078D-3C25-45B2-B5F2-59585A47BACB"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:4.97.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7B8F5C11-8610-4099-8A45-E6241F3D24E0"
            },
            {
              "criteria": "cpe:2.3:a:facebook:hhvm:4.98.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "47FF13C3-19DC-4F53-BF9D-38AC89D647D5"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve-assign@fb.com"
}