{
  "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-2024-20406",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-20406",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-09-11T16:38:50.133Z",
    "updatedAt": "2024-09-11T20:38:41.758Z",
    "importedAt": "2026-10-24T01:57:07.518Z",
    "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": "Cisco IOS XR Software Intermediate System-to-Intermediate System Denial of Service Vulnerability",
      "summary": "A vulnerability in the segment routing feature for the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending specific IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process on all affected devices that are participating in the Flexible Algorithm to crash and restart, resulting in a DoS condition.\r\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device and must have formed an adjacency. This vulnerability affects segment routing for IS-IS over IPv4 and IPv6 control planes as well as devices that are configured as level 1, level 2, or multi-level routing IS-IS type.",
      "affected": [
        {
          "vendor": "Cisco",
          "product": "Cisco IOS XR Software",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "7.4.1",
              "status": "affected"
            },
            {
              "version": "6.8.1",
              "status": "affected"
            },
            {
              "version": "7.4.15",
              "status": "affected"
            },
            {
              "version": "7.5.1",
              "status": "affected"
            },
            {
              "version": "7.4.16",
              "status": "affected"
            },
            {
              "version": "7.6.1",
              "status": "affected"
            },
            {
              "version": "7.5.2",
              "status": "affected"
            },
            {
              "version": "7.8.1",
              "status": "affected"
            },
            {
              "version": "7.6.15",
              "status": "affected"
            },
            {
              "version": "7.5.12",
              "status": "affected"
            },
            {
              "version": "7.7.1",
              "status": "affected"
            },
            {
              "version": "6.8.2",
              "status": "affected"
            },
            {
              "version": "7.4.2",
              "status": "affected"
            },
            {
              "version": "6.9.1",
              "status": "affected"
            },
            {
              "version": "7.6.2",
              "status": "affected"
            },
            {
              "version": "7.5.3",
              "status": "affected"
            },
            {
              "version": "7.7.2",
              "status": "affected"
            },
            {
              "version": "6.9.2",
              "status": "affected"
            },
            {
              "version": "7.9.1",
              "status": "affected"
            },
            {
              "version": "7.10.1",
              "status": "affected"
            },
            {
              "version": "7.8.2",
              "status": "affected"
            },
            {
              "version": "7.5.4",
              "status": "affected"
            },
            {
              "version": "7.8.22",
              "status": "affected"
            },
            {
              "version": "7.7.21",
              "status": "affected"
            },
            {
              "version": "7.9.2",
              "status": "affected"
            },
            {
              "version": "7.5.5",
              "status": "affected"
            },
            {
              "version": "7.11.1",
              "status": "affected"
            },
            {
              "version": "7.9.21",
              "status": "affected"
            },
            {
              "version": "7.10.2",
              "status": "affected"
            },
            {
              "version": "7.6.3",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}