{
  "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-2021-20322",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-20322",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2022-02-18T17:50:45.000Z",
    "updatedAt": "2026-07-30T15:52:00.927Z",
    "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": "A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.",
      "affected": [
        {
          "vendor": "n/a",
          "product": "kernel",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4.15",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "4.19.215"
            },
            {
              "version": "4.20",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "5.4.146"
            },
            {
              "version": "5.5",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "5.10.65"
            },
            {
              "version": "5.11",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "5.13.17"
            },
            {
              "version": "5.14",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "5.14.4"
            }
          ]
        }
      ]
    }
  }
}