{
  "document": {
    "acknowledgments": [
      {
        "summary": "Cisco would like to thank Luke Jenkins of Weber State University for reporting this vulnerability."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in IPv6 traffic processing of Cisco IOS XE Wireless Controller Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, adjacent attacker to cause a Layer 2 (L2) loop in a configured VLAN, resulting in a denial of service (DoS) condition for that VLAN.\r\n\r\nThe vulnerability is due to a logic error when processing specific link-local IPv6 traffic. An attacker could exploit this vulnerability by sending a crafted IPv6 packet that would flow inbound through the wired interface of an affected device. A successful exploit could allow the attacker to cause traffic drops in the affected VLAN, thus triggering the DoS condition.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the September 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication. [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74581\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco IOS XE Software:\r\n\r\nCatalyst 9800 Wireless Controllers\r\nCatalyst 9800 Wireless Controllers for Cloud",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that this vulnerability does not affect the following Cisco products:\r\n\r\nCatalyst 9800 Embedded Wireless Controller for Catalyst 9300, 9400, and 9500 Series Switches\r\nEmbedded Wireless Controller on Catalyst Access Points\r\nIOS Software\r\nIOS XR Software\r\nMeraki products\r\nNX-OS Software\r\nWireless LAN Controller (WLC) AireOS Software",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "When the wireless controller receives certain link-local IPv6 packets from the wired network on a VLAN that is used by wireless networks, those packets should be encapsulated in CAPWAP and then relayed to the Access Points broadcasting the corresponding wireless networks. However, this traffic is also being reflected back through the wireless controller\u0027s wired interfaces, resulting in a Layer 2 (L2) network loop. This could be exploited, leading to heavy traffic disruptions on the network.\r\n\r\nThe affected platforms are vulnerable with default configuration. No specific IPv6 configuration is required on the device.",
        "title": "Details"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:\r\nhttps://www.cisco.com/c/en/us/products/end-user-license-agreement.html [\"https://www.cisco.com/c/en/us/products/end-user-license-agreement.html\"]\r\n\r\nAdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.\r\n\r\nWhen considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page [\"https://www.cisco.com/go/psirt\"], to determine exposure and a complete upgrade solution.\r\n\r\nIn all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.\r\n  Customers Without Service Contracts\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]\r\n\r\nCustomers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\n      Cisco IOS and IOS XE Software\r\nTo help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (\u201cFirst Fixed\u201d). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (\u201cCombined First Fixed\u201d).\r\n\r\nCustomers can use the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] to search advisories in the following ways:\r\n\r\nChoose the software and one or more releases\r\nUpload a .txt file that includes a list of specific releases\r\nEnter the output of the show version command\r\n\r\nAfter initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication.\r\n\r\nCustomers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release\u2014for example, 15.1(4)M2 or 3.13.8S:\r\n\r\n\r\n\r\nBy default, the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "text": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "Cisco would like to thank Luke Jenkins of Weber State University for reporting this vulnerability.",
        "title": "Source"
      },
      {
        "category": "legal_disclaimer",
        "text": "THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nA standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.",
        "title": "Legal Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers IPv6 Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-ipv6-dos-NMYeCnZv"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74581"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html",
        "url": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html"
      },
      {
        "category": "external",
        "summary": "considering software upgrades",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Security Advisories page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html",
        "url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Software Checker",
        "url": "https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"
      }
    ],
    "title": "Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers IPv6 Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2021-09-28T15:57:04+00:00",
      "generator": {
        "date": "2024-05-10T23:08:05+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-ewlc-ipv6-dos-NMYeCnZv",
      "initial_release_date": "2021-09-22T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2021-09-22T15:48:26+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        },
        {
          "date": "2021-09-28T15:57:04+00:00",
          "number": "1.1.0",
          "summary": "Corrected the vulnerability source information."
        }
      ],
      "status": "final",
      "version": "1.1.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.7.1",
                    "product": {
                      "name": "16.7.1",
                      "product_id": "CSAFPID-218903"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.7.1a",
                    "product": {
                      "name": "16.7.1a",
                      "product_id": "CSAFPID-231389"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.7.1b",
                    "product": {
                      "name": "16.7.1b",
                      "product_id": "CSAFPID-232767"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.7.2",
                    "product": {
                      "name": "16.7.2",
                      "product_id": "CSAFPID-236837"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.7.3",
                    "product": {
                      "name": "16.7.3",
                      "product_id": "CSAFPID-244070"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.7.4",
                    "product": {
                      "name": "16.7.4",
                      "product_id": "CSAFPID-258388"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.7"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.8.1",
                    "product": {
                      "name": "16.8.1",
                      "product_id": "CSAFPID-218905"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.8.1a",
                    "product": {
                      "name": "16.8.1a",
                      "product_id": "CSAFPID-235307"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.8.1b",
                    "product": {
                      "name": "16.8.1b",
                      "product_id": "CSAFPID-235858"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.8.1s",
                    "product": {
                      "name": "16.8.1s",
                      "product_id": "CSAFPID-236834"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.8.1c",
                    "product": {
                      "name": "16.8.1c",
                      "product_id": "CSAFPID-237460"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.8.1d",
                    "product": {
                      "name": "16.8.1d",
                      "product_id": "CSAFPID-242834"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.8.2",
                    "product": {
                      "name": "16.8.2",
                      "product_id": "CSAFPID-244071"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.8.1e",
                    "product": {
                      "name": "16.8.1e",
                      "product_id": "CSAFPID-249171"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.8.3",
                    "product": {
                      "name": "16.8.3",
                      "product_id": "CSAFPID-257984"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.8"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.9.1",
                    "product": {
                      "name": "16.9.1",
                      "product_id": "CSAFPID-225856"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.2",
                    "product": {
                      "name": "16.9.2",
                      "product_id": "CSAFPID-232008"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.1a",
                    "product": {
                      "name": "16.9.1a",
                      "product_id": "CSAFPID-242308"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.1b",
                    "product": {
                      "name": "16.9.1b",
                      "product_id": "CSAFPID-243362"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.1s",
                    "product": {
                      "name": "16.9.1s",
                      "product_id": "CSAFPID-244530"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.1c",
                    "product": {
                      "name": "16.9.1c",
                      "product_id": "CSAFPID-245375"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.1d",
                    "product": {
                      "name": "16.9.1d",
                      "product_id": "CSAFPID-248242"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.3",
                    "product": {
                      "name": "16.9.3",
                      "product_id": "CSAFPID-251075"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.2a",
                    "product": {
                      "name": "16.9.2a",
                      "product_id": "CSAFPID-251166"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.2s",
                    "product": {
                      "name": "16.9.2s",
                      "product_id": "CSAFPID-252272"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.3h",
                    "product": {
                      "name": "16.9.3h",
                      "product_id": "CSAFPID-258229"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.4",
                    "product": {
                      "name": "16.9.4",
                      "product_id": "CSAFPID-262390"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.3s",
                    "product": {
                      "name": "16.9.3s",
                      "product_id": "CSAFPID-262549"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.3a",
                    "product": {
                      "name": "16.9.3a",
                      "product_id": "CSAFPID-263804"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.4c",
                    "product": {
                      "name": "16.9.4c",
                      "product_id": "CSAFPID-268921"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.5",
                    "product": {
                      "name": "16.9.5",
                      "product_id": "CSAFPID-271798"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.5f",
                    "product": {
                      "name": "16.9.5f",
                      "product_id": "CSAFPID-276837"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.6",
                    "product": {
                      "name": "16.9.6",
                      "product_id": "CSAFPID-277945"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.9.7",
                    "product": {
                      "name": "16.9.7",
                      "product_id": "CSAFPID-280651"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.9"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.10.1",
                    "product": {
                      "name": "16.10.1",
                      "product_id": "CSAFPID-225858"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.1a",
                    "product": {
                      "name": "16.10.1a",
                      "product_id": "CSAFPID-250629"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.1b",
                    "product": {
                      "name": "16.10.1b",
                      "product_id": "CSAFPID-252045"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.1s",
                    "product": {
                      "name": "16.10.1s",
                      "product_id": "CSAFPID-252913"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.1c",
                    "product": {
                      "name": "16.10.1c",
                      "product_id": "CSAFPID-254688"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.1e",
                    "product": {
                      "name": "16.10.1e",
                      "product_id": "CSAFPID-257955"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.1d",
                    "product": {
                      "name": "16.10.1d",
                      "product_id": "CSAFPID-258900"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.2",
                    "product": {
                      "name": "16.10.2",
                      "product_id": "CSAFPID-260917"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.1f",
                    "product": {
                      "name": "16.10.1f",
                      "product_id": "CSAFPID-262595"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.1g",
                    "product": {
                      "name": "16.10.1g",
                      "product_id": "CSAFPID-266259"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.10.3",
                    "product": {
                      "name": "16.10.3",
                      "product_id": "CSAFPID-273112"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.10"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.11.1",
                    "product": {
                      "name": "16.11.1",
                      "product_id": "CSAFPID-227918"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.11.1a",
                    "product": {
                      "name": "16.11.1a",
                      "product_id": "CSAFPID-252271"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.11.1b",
                    "product": {
                      "name": "16.11.1b",
                      "product_id": "CSAFPID-260741"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.11.2",
                    "product": {
                      "name": "16.11.2",
                      "product_id": "CSAFPID-261240"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.11.1s",
                    "product": {
                      "name": "16.11.1s",
                      "product_id": "CSAFPID-261465"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.11.1c",
                    "product": {
                      "name": "16.11.1c",
                      "product_id": "CSAFPID-264096"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.11"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.12.1",
                    "product": {
                      "name": "16.12.1",
                      "product_id": "CSAFPID-227920"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1s",
                    "product": {
                      "name": "16.12.1s",
                      "product_id": "CSAFPID-265735"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1a",
                    "product": {
                      "name": "16.12.1a",
                      "product_id": "CSAFPID-265841"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1c",
                    "product": {
                      "name": "16.12.1c",
                      "product_id": "CSAFPID-267110"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1w",
                    "product": {
                      "name": "16.12.1w",
                      "product_id": "CSAFPID-267240"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.2",
                    "product": {
                      "name": "16.12.2",
                      "product_id": "CSAFPID-267605"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1y",
                    "product": {
                      "name": "16.12.1y",
                      "product_id": "CSAFPID-271938"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.2a",
                    "product": {
                      "name": "16.12.2a",
                      "product_id": "CSAFPID-272047"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.3",
                    "product": {
                      "name": "16.12.3",
                      "product_id": "CSAFPID-273445"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.2s",
                    "product": {
                      "name": "16.12.2s",
                      "product_id": "CSAFPID-273509"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1x",
                    "product": {
                      "name": "16.12.1x",
                      "product_id": "CSAFPID-273649"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1t",
                    "product": {
                      "name": "16.12.1t",
                      "product_id": "CSAFPID-274832"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.2t",
                    "product": {
                      "name": "16.12.2t",
                      "product_id": "CSAFPID-275538"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.4",
                    "product": {
                      "name": "16.12.4",
                      "product_id": "CSAFPID-277147"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.3s",
                    "product": {
                      "name": "16.12.3s",
                      "product_id": "CSAFPID-277255"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1z",
                    "product": {
                      "name": "16.12.1z",
                      "product_id": "CSAFPID-277256"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.3a",
                    "product": {
                      "name": "16.12.3a",
                      "product_id": "CSAFPID-277321"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.4a",
                    "product": {
                      "name": "16.12.4a",
                      "product_id": "CSAFPID-278881"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.12.1z1",
                    "product": {
                      "name": "16.12.1z1",
                      "product_id": "CSAFPID-281320"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.12"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "17.1.1",
                    "product": {
                      "name": "17.1.1",
                      "product_id": "CSAFPID-245377"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.1.1a",
                    "product": {
                      "name": "17.1.1a",
                      "product_id": "CSAFPID-272932"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.1.1s",
                    "product": {
                      "name": "17.1.1s",
                      "product_id": "CSAFPID-274818"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.1.2",
                    "product": {
                      "name": "17.1.2",
                      "product_id": "CSAFPID-277338"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.1.1t",
                    "product": {
                      "name": "17.1.1t",
                      "product_id": "CSAFPID-277348"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.1.3",
                    "product": {
                      "name": "17.1.3",
                      "product_id": "CSAFPID-280652"
                    }
                  }
                ],
                "category": "product_version",
                "name": "17.1"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "17.2.1",
                    "product": {
                      "name": "17.2.1",
                      "product_id": "CSAFPID-251225"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.2.1r",
                    "product": {
                      "name": "17.2.1r",
                      "product_id": "CSAFPID-277194"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.2.1a",
                    "product": {
                      "name": "17.2.1a",
                      "product_id": "CSAFPID-277343"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.2.1v",
                    "product": {
                      "name": "17.2.1v",
                      "product_id": "CSAFPID-278002"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.2.2",
                    "product": {
                      "name": "17.2.2",
                      "product_id": "CSAFPID-278504"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.2.3",
                    "product": {
                      "name": "17.2.3",
                      "product_id": "CSAFPID-280939"
                    }
                  }
                ],
                "category": "product_version",
                "name": "17.2"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "17.3.1",
                    "product": {
                      "name": "17.3.1",
                      "product_id": "CSAFPID-254712"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.3.2",
                    "product": {
                      "name": "17.3.2",
                      "product_id": "CSAFPID-277099"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.3.1a",
                    "product": {
                      "name": "17.3.1a",
                      "product_id": "CSAFPID-279338"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.3.1w",
                    "product": {
                      "name": "17.3.1w",
                      "product_id": "CSAFPID-279339"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.3.2a",
                    "product": {
                      "name": "17.3.2a",
                      "product_id": "CSAFPID-280555"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.3.1x",
                    "product": {
                      "name": "17.3.1x",
                      "product_id": "CSAFPID-280783"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.3.1z",
                    "product": {
                      "name": "17.3.1z",
                      "product_id": "CSAFPID-281331"
                    }
                  }
                ],
                "category": "product_version",
                "name": "17.3"
              }
            ],
            "category": "product_family",
            "name": "Cisco IOS XE Software"
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-34767",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvw18506"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-218903",
          "CSAFPID-218905",
          "CSAFPID-225856",
          "CSAFPID-225858",
          "CSAFPID-227918",
          "CSAFPID-227920",
          "CSAFPID-231389",
          "CSAFPID-232008",
          "CSAFPID-232767",
          "CSAFPID-235307",
          "CSAFPID-235858",
          "CSAFPID-236834",
          "CSAFPID-236837",
          "CSAFPID-237460",
          "CSAFPID-242308",
          "CSAFPID-242834",
          "CSAFPID-243362",
          "CSAFPID-244070",
          "CSAFPID-244071",
          "CSAFPID-244530",
          "CSAFPID-245375",
          "CSAFPID-245377",
          "CSAFPID-248242",
          "CSAFPID-249171",
          "CSAFPID-250629",
          "CSAFPID-251075",
          "CSAFPID-251166",
          "CSAFPID-251225",
          "CSAFPID-252045",
          "CSAFPID-252271",
          "CSAFPID-252272",
          "CSAFPID-252913",
          "CSAFPID-254688",
          "CSAFPID-254712",
          "CSAFPID-257955",
          "CSAFPID-257984",
          "CSAFPID-258229",
          "CSAFPID-258388",
          "CSAFPID-258900",
          "CSAFPID-260741",
          "CSAFPID-260917",
          "CSAFPID-261240",
          "CSAFPID-261465",
          "CSAFPID-262390",
          "CSAFPID-262549",
          "CSAFPID-262595",
          "CSAFPID-263804",
          "CSAFPID-264096",
          "CSAFPID-265735",
          "CSAFPID-265841",
          "CSAFPID-266259",
          "CSAFPID-267110",
          "CSAFPID-267240",
          "CSAFPID-267605",
          "CSAFPID-268921",
          "CSAFPID-271798",
          "CSAFPID-271938",
          "CSAFPID-272047",
          "CSAFPID-272932",
          "CSAFPID-273112",
          "CSAFPID-273445",
          "CSAFPID-273509",
          "CSAFPID-273649",
          "CSAFPID-274818",
          "CSAFPID-274832",
          "CSAFPID-275538",
          "CSAFPID-276837",
          "CSAFPID-277099",
          "CSAFPID-277147",
          "CSAFPID-277194",
          "CSAFPID-277255",
          "CSAFPID-277256",
          "CSAFPID-277321",
          "CSAFPID-277338",
          "CSAFPID-277343",
          "CSAFPID-277348",
          "CSAFPID-277945",
          "CSAFPID-278002",
          "CSAFPID-278504",
          "CSAFPID-278881",
          "CSAFPID-279338",
          "CSAFPID-279339",
          "CSAFPID-280555",
          "CSAFPID-280651",
          "CSAFPID-280652",
          "CSAFPID-280783",
          "CSAFPID-280939",
          "CSAFPID-281320",
          "CSAFPID-281331"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-218903",
            "CSAFPID-218905",
            "CSAFPID-225856",
            "CSAFPID-225858",
            "CSAFPID-227918",
            "CSAFPID-227920",
            "CSAFPID-231389",
            "CSAFPID-232008",
            "CSAFPID-232767",
            "CSAFPID-235307",
            "CSAFPID-235858",
            "CSAFPID-236834",
            "CSAFPID-236837",
            "CSAFPID-237460",
            "CSAFPID-242308",
            "CSAFPID-242834",
            "CSAFPID-243362",
            "CSAFPID-244070",
            "CSAFPID-244071",
            "CSAFPID-244530",
            "CSAFPID-245375",
            "CSAFPID-245377",
            "CSAFPID-248242",
            "CSAFPID-249171",
            "CSAFPID-250629",
            "CSAFPID-251075",
            "CSAFPID-251166",
            "CSAFPID-251225",
            "CSAFPID-252045",
            "CSAFPID-252271",
            "CSAFPID-252272",
            "CSAFPID-252913",
            "CSAFPID-254688",
            "CSAFPID-254712",
            "CSAFPID-257955",
            "CSAFPID-257984",
            "CSAFPID-258229",
            "CSAFPID-258388",
            "CSAFPID-258900",
            "CSAFPID-260741",
            "CSAFPID-260917",
            "CSAFPID-261240",
            "CSAFPID-261465",
            "CSAFPID-262390",
            "CSAFPID-262549",
            "CSAFPID-262595",
            "CSAFPID-263804",
            "CSAFPID-264096",
            "CSAFPID-265735",
            "CSAFPID-265841",
            "CSAFPID-266259",
            "CSAFPID-267110",
            "CSAFPID-267240",
            "CSAFPID-267605",
            "CSAFPID-268921",
            "CSAFPID-271798",
            "CSAFPID-271938",
            "CSAFPID-272047",
            "CSAFPID-272932",
            "CSAFPID-273112",
            "CSAFPID-273445",
            "CSAFPID-273509",
            "CSAFPID-273649",
            "CSAFPID-274818",
            "CSAFPID-274832",
            "CSAFPID-275538",
            "CSAFPID-276837",
            "CSAFPID-277099",
            "CSAFPID-277147",
            "CSAFPID-277194",
            "CSAFPID-277255",
            "CSAFPID-277256",
            "CSAFPID-277321",
            "CSAFPID-277338",
            "CSAFPID-277343",
            "CSAFPID-277348",
            "CSAFPID-277945",
            "CSAFPID-278002",
            "CSAFPID-278504",
            "CSAFPID-278881",
            "CSAFPID-279338",
            "CSAFPID-279339",
            "CSAFPID-280555",
            "CSAFPID-280651",
            "CSAFPID-280652",
            "CSAFPID-280783",
            "CSAFPID-280939",
            "CSAFPID-281320",
            "CSAFPID-281331"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-218903",
            "CSAFPID-218905",
            "CSAFPID-225856",
            "CSAFPID-225858",
            "CSAFPID-227918",
            "CSAFPID-227920",
            "CSAFPID-231389",
            "CSAFPID-232008",
            "CSAFPID-232767",
            "CSAFPID-235307",
            "CSAFPID-235858",
            "CSAFPID-236834",
            "CSAFPID-236837",
            "CSAFPID-237460",
            "CSAFPID-242308",
            "CSAFPID-242834",
            "CSAFPID-243362",
            "CSAFPID-244070",
            "CSAFPID-244071",
            "CSAFPID-244530",
            "CSAFPID-245375",
            "CSAFPID-245377",
            "CSAFPID-248242",
            "CSAFPID-249171",
            "CSAFPID-250629",
            "CSAFPID-251075",
            "CSAFPID-251166",
            "CSAFPID-251225",
            "CSAFPID-252045",
            "CSAFPID-252271",
            "CSAFPID-252272",
            "CSAFPID-252913",
            "CSAFPID-254688",
            "CSAFPID-254712",
            "CSAFPID-257955",
            "CSAFPID-257984",
            "CSAFPID-258229",
            "CSAFPID-258388",
            "CSAFPID-258900",
            "CSAFPID-260741",
            "CSAFPID-260917",
            "CSAFPID-261240",
            "CSAFPID-261465",
            "CSAFPID-262390",
            "CSAFPID-262549",
            "CSAFPID-262595",
            "CSAFPID-263804",
            "CSAFPID-264096",
            "CSAFPID-265735",
            "CSAFPID-265841",
            "CSAFPID-266259",
            "CSAFPID-267110",
            "CSAFPID-267240",
            "CSAFPID-267605",
            "CSAFPID-268921",
            "CSAFPID-271798",
            "CSAFPID-271938",
            "CSAFPID-272047",
            "CSAFPID-272932",
            "CSAFPID-273112",
            "CSAFPID-273445",
            "CSAFPID-273509",
            "CSAFPID-273649",
            "CSAFPID-274818",
            "CSAFPID-274832",
            "CSAFPID-275538",
            "CSAFPID-276837",
            "CSAFPID-277099",
            "CSAFPID-277147",
            "CSAFPID-277194",
            "CSAFPID-277255",
            "CSAFPID-277256",
            "CSAFPID-277321",
            "CSAFPID-277338",
            "CSAFPID-277343",
            "CSAFPID-277348",
            "CSAFPID-277945",
            "CSAFPID-278002",
            "CSAFPID-278504",
            "CSAFPID-278881",
            "CSAFPID-279338",
            "CSAFPID-279339",
            "CSAFPID-280555",
            "CSAFPID-280651",
            "CSAFPID-280652",
            "CSAFPID-280783",
            "CSAFPID-280939",
            "CSAFPID-281320",
            "CSAFPID-281331"
          ]
        }
      ],
      "title": "Cisco IOS XE Software Catalyst 9800 Series Wireless Controllers IPv6 Denial of Service Vulnerability"
    }
  ]
}