{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-24036",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-24036",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-07-23T00:30:16.000Z",
    "updatedAt": "2024-08-03T19:21:17.359Z",
    "importedAt": "2026-10-24T01:56:26.894Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": null,
      "summary": "Passing an attacker controlled size when creating an IOBuf could cause integer overflow, leading to an out of bounds write on the heap with the possibility of remote code execution. This issue affects versions of folly prior to v2021.07.22.00. This issue affects HHVM versions prior to 4.80.5, all versions between 4.81.0 and 4.102.1, all versions between 4.103.0 and 4.113.0, and versions 4.114.0, 4.115.0, 4.116.0, 4.117.0, 4.118.0 and 4.118.1.",
      "affected": [
        {
          "vendor": "Facebook",
          "product": "folly",
          "versions": [
            {
              "version": "v2021.07.22.00",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "unspecified",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "v2021.07.22.00"
            }
          ]
        },
        {
          "vendor": "Facebook",
          "product": "HHVM",
          "versions": [
            {
              "version": "4.118.2",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.118.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.117.1",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.117.0",
              "status": "affected"
            },
            {
              "version": "4.116.1",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.116.0",
              "status": "affected"
            },
            {
              "version": "4.115.1",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.115.0",
              "status": "affected"
            },
            {
              "version": "4.114.1",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.114.0",
              "status": "affected"
            },
            {
              "version": "4.113.1",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.113.0",
              "status": "affected"
            },
            {
              "version": "4.102.2",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.102.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.81.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "4.80.5",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "unspecified"
            },
            {
              "version": "unspecified",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "4.80.5"
            }
          ]
        }
      ]
    }
  }
}