{
  "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-2023-36839",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-36839",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2023-10-12T22:56:24.897Z",
    "updatedAt": "2024-09-18T18:03:21.702Z",
    "importedAt": "2026-10-24T01:56:53.804Z",
    "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": "Junos OS and Junos OS Evolved: An l2cpd crash will occur when specific LLDP packets are received",
      "summary": "\nAn Improper Validation of Specified Quantity in Input vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker who sends specific LLDP packets to cause a Denial of Service(DoS).\n\nThis issue occurs when specific LLDP packets are received and telemetry polling is being done on the device. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  All versions prior to 20.4R3-S8;\n  *  21.1 version 21.1R1 and later versions;\n  *  21.2 versions prior to 21.2R3-S5;\n  *  21.3 versions prior to 21.3R3-S4;\n  *  21.4 versions prior to 21.4R3-S3;\n  *  22.1 versions prior to 22.1R3-S2;\n  *  22.2 versions prior to 22.2R3;\n  *  22.3 versions prior to 22.3R2-S2;\n  *  22.4 versions prior to 22.4R2;\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n  *  All versions prior to 20.4R3-S8-EVO;\n  *  21.1 version 21.1R1-EVO and later versions;\n  *  21.2 versions prior to 21.2R3-S5-EVO;\n  *  21.3 versions prior to 21.3R3-S4-EVO;\n  *  21.4 versions prior to 21.4R3-S3-EVO;\n  *  22.1 versions prior to 22.1R3-S2-EVO;\n  *  22.2 versions prior to 22.2R3-EVO;\n  *  22.3 versions prior to 22.3R2-S2-EVO;\n  *  22.4 versions prior to 22.4R1-S1-EVO;\n\n\n\n\n\n\n",
      "affected": [
        {
          "vendor": "Juniper Networks",
          "product": "Junos OS",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "20.4R3-S8"
            },
            {
              "version": "21.1R1",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "21.1*"
            },
            {
              "version": "21.2",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "21.2R3-S5"
            },
            {
              "version": "21.3",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "21.3R3-S4"
            },
            {
              "version": "21.4",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "21.4R3-S3"
            },
            {
              "version": "22.1",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "22.1R3-S2"
            },
            {
              "version": "22.2",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "22.2R3"
            },
            {
              "version": "22.3",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "22.3R2-S2, 22.3R3"
            },
            {
              "version": "22.4",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "22.4R2"
            }
          ]
        },
        {
          "vendor": "Juniper Networks",
          "product": "Junos OS Evolved",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "20.4R3-S8-EVO"
            },
            {
              "version": "21.1R1-EVO",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "21.1*-EVO"
            },
            {
              "version": "21.2-EVO",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "21.2R3-S5-EVO"
            },
            {
              "version": "21.3-EVO",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "21.3R3-S4-EVO"
            },
            {
              "version": "21.4-EVO",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "21.4R3-S3-EVO"
            },
            {
              "version": "22.1-EVO",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "22.1R3-S2-EVO"
            },
            {
              "version": "22.2-EVO",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "22.2R3-EVO"
            },
            {
              "version": "22.3-EVO",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "22.3R2-S2-EVO, 22.3R3-EVO"
            },
            {
              "version": "22.4-EVO",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "22.4R1-S1-EVO, 22.4R2-EVO"
            }
          ]
        }
      ]
    }
  }
}