{
  "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-2023-20191",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-20191",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2023-09-13T16:41:32.625Z",
    "updatedAt": "2024-08-02T09:05:35.459Z",
    "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 access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.\r\n\r This vulnerability is due to incomplete support for this feature. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device.\r\n\r   There are workarounds that address this vulnerability.\r\n\r   \r\n\r \r This advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication .",
      "affected": [
        {
          "vendor": "Cisco",
          "product": "Cisco IOS XR Software",
          "versions": [
            {
              "version": "6.4.1",
              "status": "affected"
            },
            {
              "version": "6.5.1",
              "status": "affected"
            },
            {
              "version": "6.5.2",
              "status": "affected"
            },
            {
              "version": "6.5.3",
              "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": "7.1.2",
              "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": "7.3.5",
              "status": "affected"
            },
            {
              "version": "7.4.1",
              "status": "affected"
            },
            {
              "version": "7.4.2",
              "status": "affected"
            },
            {
              "version": "7.5.1",
              "status": "affected"
            },
            {
              "version": "7.5.3",
              "status": "affected"
            },
            {
              "version": "7.5.2",
              "status": "affected"
            },
            {
              "version": "7.5.4",
              "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": "7.8.1",
              "status": "affected"
            },
            {
              "version": "7.8.2",
              "status": "affected"
            },
            {
              "version": "7.9.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}