{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during the resolution of a Cisco TAC support case."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the Wireless Network Control daemon (wncd) of Cisco IOS XE Software for Wireless LAN Controllers could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper memory management. An attacker could exploit this vulnerability by sending a series of network requests to an affected device. A successful exploit could allow the attacker to cause the wncd process to consume available memory and eventually cause the device to reload, resulting in a 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\nThis advisory is part of the September 2023 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 2023 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74916\"].\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco IOS XE Software and had the mDNS enabled:\r\n\r\nCatalyst 9800 Embedded Wireless Controllers for Catalyst 9300, 9400, and 9500 Series Switches\r\nCatalyst 9800 Series Wireless Controllers\r\nCatalyst 9800-CL Wireless Controllers for Cloud\r\nEmbedded Wireless Controllers on Catalyst Access Points",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by these vulnerabilities.\r\n\r\nCisco has confirmed that this vulnerability does not affect the following Cisco products:\r\n\r\nIOS Software\r\nIOS XR Software\r\nMeraki products\r\nNX-OS Software\r\nWLC AireOS Software",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "When 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        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\"]. This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory (\u201cFirst Fixed\u201d). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities that are described in all the advisories that the Software Checker identifies (\u201cCombined First Fixed\u201d).\r\n\r\nTo use the tool, go to the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] page and follow the instructions. Alternatively, use the following form to determine whether a release is affected by any Cisco Security Advisory. To use the form, follow these steps:\r\n\r\nChoose which advisories the tool will search\u2014only this advisory, only advisories with a Critical or High Security Impact Rating (SIR) [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#asr\"], or all advisories.\r\nEnter a release number\u2014for example, 15.9(3)M2 or 17.3.3.\r\nClick Check.\r\n\r\n       Only this advisory  All Critical and High advisories  All advisories",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"http://www.cisco.com/web/about/security/psirt/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": "This vulnerability was found during the resolution of a Cisco TAC support case.",
        "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 Wireless LAN Controllers Wireless Network Control Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-wncd-HFGMsfSD"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: September 2023 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74916"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.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 Security Advisories page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "Cisco Software Checker",
        "url": "https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"
      },
      {
        "category": "external",
        "summary": "Security Impact Rating (SIR)",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#asr"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco IOS XE Software for Wireless LAN Controllers Wireless Network Control Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2023-09-27T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T23:26:40+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-wlc-wncd-HFGMsfSD",
      "initial_release_date": "2023-09-27T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2023-09-27T15:51:11+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "17.10.1",
                    "product": {
                      "name": "17.10.1",
                      "product_id": "CSAFPID-278018"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.10.1a",
                    "product": {
                      "name": "17.10.1a",
                      "product_id": "CSAFPID-290580"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.10.1b",
                    "product": {
                      "name": "17.10.1b",
                      "product_id": "CSAFPID-292650"
                    }
                  }
                ],
                "category": "product_version",
                "name": "17.10"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "17.9.1",
                    "product": {
                      "name": "17.9.1",
                      "product_id": "CSAFPID-278025"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.9.1w",
                    "product": {
                      "name": "17.9.1w",
                      "product_id": "CSAFPID-286802"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.9.2",
                    "product": {
                      "name": "17.9.2",
                      "product_id": "CSAFPID-288221"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.9.1a",
                    "product": {
                      "name": "17.9.1a",
                      "product_id": "CSAFPID-288247"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.9.1x",
                    "product": {
                      "name": "17.9.1x",
                      "product_id": "CSAFPID-289372"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.9.1y",
                    "product": {
                      "name": "17.9.1y",
                      "product_id": "CSAFPID-290673"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.9.2a",
                    "product": {
                      "name": "17.9.2a",
                      "product_id": "CSAFPID-290675"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "17.9.1x1",
                    "product": {
                      "name": "17.9.1x1",
                      "product_id": "CSAFPID-292876"
                    }
                  }
                ],
                "category": "product_version",
                "name": "17.9"
              }
            ],
            "category": "product_family",
            "name": "Cisco IOS XE Software"
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-20202",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwd91107"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-278018",
          "CSAFPID-278025",
          "CSAFPID-286802",
          "CSAFPID-288221",
          "CSAFPID-288247",
          "CSAFPID-289372",
          "CSAFPID-290580",
          "CSAFPID-290673",
          "CSAFPID-290675",
          "CSAFPID-292650",
          "CSAFPID-292876"
        ]
      },
      "release_date": "2023-09-27T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-278018",
            "CSAFPID-278025",
            "CSAFPID-286802",
            "CSAFPID-288221",
            "CSAFPID-288247",
            "CSAFPID-289372",
            "CSAFPID-290580",
            "CSAFPID-290673",
            "CSAFPID-290675",
            "CSAFPID-292650",
            "CSAFPID-292876"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-278018",
            "CSAFPID-278025",
            "CSAFPID-286802",
            "CSAFPID-288221",
            "CSAFPID-288247",
            "CSAFPID-289372",
            "CSAFPID-290580",
            "CSAFPID-290673",
            "CSAFPID-290675",
            "CSAFPID-292650",
            "CSAFPID-292876"
          ]
        }
      ],
      "title": "Cisco IOS XE Software for Wireless LAN Controllers Wireless Network Controller Denial of Service Vulnerability"
    }
  ]
}