{
  "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-2023-20233",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-20233",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2023-09-13T16:40:15.314Z",
    "updatedAt": "2024-08-02T09:05:36.620Z",
    "importedAt": "2026-10-24T01:56:49.724Z",
    "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 vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r This vulnerability is due to incorrect processing of invalid continuity check messages (CCMs). An attacker could exploit this vulnerability by sending crafted CCMs to an affected device. A successful exploit could allow the attacker to cause the CFM service to crash when a user displays information about maintenance end points (MEPs) for peer MEPs on an affected device.",
      "affected": [
        {
          "vendor": "Cisco",
          "product": "Cisco IOS XR Software",
          "versions": [
            {
              "version": "5.2.0",
              "status": "affected"
            },
            {
              "version": "5.2.1",
              "status": "affected"
            },
            {
              "version": "5.2.2",
              "status": "affected"
            },
            {
              "version": "5.2.4",
              "status": "affected"
            },
            {
              "version": "5.2.3",
              "status": "affected"
            },
            {
              "version": "5.2.5",
              "status": "affected"
            },
            {
              "version": "5.3.0",
              "status": "affected"
            },
            {
              "version": "5.3.1",
              "status": "affected"
            },
            {
              "version": "5.3.2",
              "status": "affected"
            },
            {
              "version": "5.3.3",
              "status": "affected"
            },
            {
              "version": "5.3.4",
              "status": "affected"
            },
            {
              "version": "6.1.1",
              "status": "affected"
            },
            {
              "version": "6.1.2",
              "status": "affected"
            },
            {
              "version": "6.1.3",
              "status": "affected"
            },
            {
              "version": "6.1.4",
              "status": "affected"
            },
            {
              "version": "6.2.1",
              "status": "affected"
            },
            {
              "version": "6.2.2",
              "status": "affected"
            },
            {
              "version": "6.2.3",
              "status": "affected"
            },
            {
              "version": "6.2.25",
              "status": "affected"
            },
            {
              "version": "6.3.2",
              "status": "affected"
            },
            {
              "version": "6.3.3",
              "status": "affected"
            },
            {
              "version": "6.3.15",
              "status": "affected"
            },
            {
              "version": "6.4.1",
              "status": "affected"
            },
            {
              "version": "6.4.2",
              "status": "affected"
            },
            {
              "version": "6.4.3",
              "status": "affected"
            },
            {
              "version": "6.5.1",
              "status": "affected"
            },
            {
              "version": "6.5.2",
              "status": "affected"
            },
            {
              "version": "6.6.2",
              "status": "affected"
            },
            {
              "version": "6.6.3",
              "status": "affected"
            },
            {
              "version": "6.6.25",
              "status": "affected"
            },
            {
              "version": "6.6.4",
              "status": "affected"
            },
            {
              "version": "7.0.1",
              "status": "affected"
            },
            {
              "version": "7.0.2",
              "status": "affected"
            },
            {
              "version": "7.1.1",
              "status": "affected"
            },
            {
              "version": "7.1.15",
              "status": "affected"
            },
            {
              "version": "7.1.2",
              "status": "affected"
            },
            {
              "version": "7.1.3",
              "status": "affected"
            },
            {
              "version": "6.7.1",
              "status": "affected"
            },
            {
              "version": "6.7.2",
              "status": "affected"
            },
            {
              "version": "6.7.3",
              "status": "affected"
            },
            {
              "version": "6.7.4",
              "status": "affected"
            },
            {
              "version": "7.2.1",
              "status": "affected"
            },
            {
              "version": "7.2.2",
              "status": "affected"
            },
            {
              "version": "7.3.1",
              "status": "affected"
            },
            {
              "version": "7.3.2",
              "status": "affected"
            },
            {
              "version": "7.3.3",
              "status": "affected"
            },
            {
              "version": "7.4.1",
              "status": "affected"
            },
            {
              "version": "7.4.2",
              "status": "affected"
            },
            {
              "version": "6.8.1",
              "status": "affected"
            },
            {
              "version": "6.8.2",
              "status": "affected"
            },
            {
              "version": "7.5.1",
              "status": "affected"
            },
            {
              "version": "7.5.3",
              "status": "affected"
            },
            {
              "version": "7.5.2",
              "status": "affected"
            },
            {
              "version": "7.6.1",
              "status": "affected"
            },
            {
              "version": "7.6.2",
              "status": "affected"
            },
            {
              "version": "7.7.1",
              "status": "affected"
            },
            {
              "version": "7.7.2",
              "status": "affected"
            },
            {
              "version": "6.9.1",
              "status": "affected"
            },
            {
              "version": "6.9.2",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}