{
  "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-2026-21901",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-21901",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-09T21:01:31.334Z",
    "updatedAt": "2026-07-10T14:21:31.624Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "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: Configuration of a specific SSH option results in mgd crash",
      "summary": "A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a specific SSH configuration parameter to create a Denial of Service (DoS).\n\nA local high-privileged user configuring or deactivating a specific 'system services ssh' configuration parameter can exploit a null pointer dereference in one of the functions used by SSH. The function attempts to dereference a null pointer when accessing certain configuration data, resulting in an mgd process crash and restart. Continued execution of these configuration commands will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects:\nJunos OS:\n\n\n  *  from 22.3 before 22.3R3-S5;\n  *  from 22.4 before 22.4R3-S10;\n  *  from 23.2 before 23.2R2-S7;\n  *  from 23.4 before 23.4R2-S8.\n\n\n\n\nThis issue does not affect Junos OS before 22.3R1.\n\n\n\nJunos OS Evolved:\n  *  from 22.3R1-EVO before 23.2R2-S7-EVO;\n  *  from 23.4 before 23.4R2-S8-EVO.\n\n\nThis issue does not affect Junos OS Evolved before 22.3R1-EVO.",
      "affected": [
        {
          "vendor": "Juniper Networks",
          "product": "Junos OS",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "22.3",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "22.3R3-S5"
            },
            {
              "version": "22.4",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "22.4R3-S10"
            },
            {
              "version": "23.2",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "23.2R2-S7"
            },
            {
              "version": "23.4",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "23.4R2-S8"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "22.3R1"
            }
          ]
        },
        {
          "vendor": "Juniper Networks",
          "product": "Junos OS Evolved",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "23.2",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "23.2R2-S7-EVO"
            },
            {
              "version": "23.4",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "23.4R2-S8-EVO"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "custom",
              "lessThan": "22.3R1-EVO"
            }
          ]
        }
      ]
    }
  }
}