{
  "document": {
    "acknowledgments": [],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "title": "Summary",
        "text": "A vulnerability in the UDP processing code of Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a denial of service (DoS) condition.\r\n\r\nThe vulnerability is due to Cisco IOS Software application changes that create UDP sockets and leave the sockets idle without closing them. An attacker could exploit this vulnerability by sending UDP packets with a destination port of 0 to an affected device. A successful exploit could allow the attacker to cause UDP packets to be held in the input interfaces queue, resulting in a DoS condition. The input interface queue will stop holding UDP packets when it receives 250 packets.\r\n\r\nThere are workarounds that address this vulnerability.\r\n\r\n"
      },
      {
        "category": "general",
        "title": "Vulnerable Products",
        "text": "This vulnerability affects Cisco IOS and Cisco IOS XE Software. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory."
      },
      {
        "category": "general",
        "title": "Products Confirmed Not Vulnerable",
        "text": "No other Cisco products are currently known to be affected by this vulnerability."
      },
      {
        "category": "general",
        "title": "Workarounds",
        "text": "To work around this vulnerability, administrators can set a maximum hold queue value that is greater than 250 for all device interfaces. The following example shows how to set the value to 350 by using the hold queue in interface configuration command:\r\n\r\n\r\nRouter# configure terminal\r\nRouter(config)# interface gigabitEthernet 1  Router(config-if)# hold-queue 350 in\r\n\r\nAdministrators can also configure an access-control list (ACL) that blocks UDP packets with a destination port of 0 and apply the ACL to all device interfaces, for example:\r\n\r\n\r\nExtended IP access list 180\r\n    10 deny udp any any eq 0"
      },
      {
        "category": "general",
        "title": "Fixed Software",
        "text": "For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory.\r\n\r\nWhen considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts 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."
      },
      {
        "category": "general",
        "title": "Vulnerability Policy",
        "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."
      },
      {
        "category": "general",
        "title": "Exploitation and Public Announcements",
        "text": "In March 2022, the Cisco Product Security Incident Response Team (PSIRT) became aware of additional attempted exploitation of this vulnerability in the wild. Cisco continues to strongly recommend that customers upgrade to a fixed software release to remediate this vulnerability."
      },
      {
        "category": "legal_disclaimer",
        "title": "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."
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "Emergency Support:\r\n+1 877 228 7302 (toll-free within North America)\r\n+1 408 525 6532 (International direct-dial)\r\nNon-emergency Support:\r\nEmail: psirt@cisco.com\r\nSupport requests that are received via e-mail are typically acknowledged within 48 hours.",
      "issuing_authority": "Cisco product security incident response is the responsibility of the Cisco Product Security Incident Response Team (PSIRT). The Cisco PSIRT is a dedicated, global team that manages the receipt, investigation, and public reporting of security vulnerability information that is related to Cisco products and networks. The on-call Cisco PSIRT works 24x7 with Cisco customers, independent security researchers, consultants, industry organizations, and other vendors to identify possible security issues with Cisco products and networks.\r\nMore information can be found in Cisco Security Vulnerability Policy available at https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco IOS and Cisco IOS XE Software UDP Packet Processing Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-ios-udp"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories and Alerts page",
        "url": "https://www.cisco.com/go/psirt"
      }
    ],
    "title": "Cisco IOS and Cisco IOS XE Software UDP Packet Processing Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2022-12-17T05:53:01+00:00",
      "generator": {
        "date": "2022-12-17T05:53:04+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20170906-ios-udp",
      "initial_release_date": "2017-09-06T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2017-09-06T16:35:50+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        },
        {
          "date": "2017-09-07T13:35:32+00:00",
          "number": "1.1.0",
          "summary": "Corrected the list of Cisco bug  IDs."
        },
        {
          "date": "2022-12-17T05:53:01+00:00",
          "number": "1.2.0",
          "summary": "Updated exploitation information."
        }
      ],
      "status": "final",
      "version": "1.2.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "name": "Cisco",
        "category": "vendor",
        "branches": [
          {
            "name": "IOS",
            "category": "product_family",
            "product": {
              "name": "Cisco IOS ",
              "product_id": "CSAFPID-2097"
            }
          },
          {
            "name": "Cisco IOS XE Software",
            "category": "product_family",
            "branches": [
              {
                "name": "3.14S",
                "category": "product_version",
                "branches": [
                  {
                    "name": "3.14.0S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.14.0S",
                      "product_id": "CSAFPID-206178"
                    }
                  },
                  {
                    "name": "3.14.1S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.14.1S",
                      "product_id": "CSAFPID-206181"
                    }
                  },
                  {
                    "name": "3.14.2S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.14.2S",
                      "product_id": "CSAFPID-206191"
                    }
                  },
                  {
                    "name": "3.14.3S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.14.3S",
                      "product_id": "CSAFPID-206192"
                    }
                  },
                  {
                    "name": "3.14.4S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.14.4S",
                      "product_id": "CSAFPID-206193"
                    }
                  }
                ]
              },
              {
                "name": "3.15S",
                "category": "product_version",
                "branches": [
                  {
                    "name": "3.15.0S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.15.0S",
                      "product_id": "CSAFPID-206180"
                    }
                  },
                  {
                    "name": "3.15.1S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.15.1S",
                      "product_id": "CSAFPID-210079"
                    }
                  },
                  {
                    "name": "3.15.2S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.15.2S",
                      "product_id": "CSAFPID-212268"
                    }
                  },
                  {
                    "name": "3.15.1cS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.15.1cS",
                      "product_id": "CSAFPID-213700"
                    }
                  },
                  {
                    "name": "3.15.3S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.15.3S",
                      "product_id": "CSAFPID-213776"
                    }
                  },
                  {
                    "name": "3.15.4S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.15.4S",
                      "product_id": "CSAFPID-217264"
                    }
                  }
                ]
              },
              {
                "name": "3.16S",
                "category": "product_version",
                "branches": [
                  {
                    "name": "3.16.0S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.0S",
                      "product_id": "CSAFPID-210081"
                    }
                  },
                  {
                    "name": "3.16.1S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.1S",
                      "product_id": "CSAFPID-212408"
                    }
                  },
                  {
                    "name": "3.16.0aS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.0aS",
                      "product_id": "CSAFPID-213476"
                    }
                  },
                  {
                    "name": "3.16.1aS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.1aS",
                      "product_id": "CSAFPID-213477"
                    }
                  },
                  {
                    "name": "3.16.2S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.2S",
                      "product_id": "CSAFPID-213478"
                    }
                  },
                  {
                    "name": "3.16.2aS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.2aS",
                      "product_id": "CSAFPID-213635"
                    }
                  },
                  {
                    "name": "3.16.0bS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.0bS",
                      "product_id": "CSAFPID-213777"
                    }
                  },
                  {
                    "name": "3.16.0cS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.0cS",
                      "product_id": "CSAFPID-213778"
                    }
                  },
                  {
                    "name": "3.16.3S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.3S",
                      "product_id": "CSAFPID-213779"
                    }
                  },
                  {
                    "name": "3.16.2bS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.2bS",
                      "product_id": "CSAFPID-217265"
                    }
                  },
                  {
                    "name": "3.16.3aS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.3aS",
                      "product_id": "CSAFPID-217266"
                    }
                  },
                  {
                    "name": "3.16.4S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.4S",
                      "product_id": "CSAFPID-217267"
                    }
                  },
                  {
                    "name": "3.16.4aS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.4aS",
                      "product_id": "CSAFPID-220993"
                    }
                  },
                  {
                    "name": "3.16.4bS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.4bS",
                      "product_id": "CSAFPID-222257"
                    }
                  },
                  {
                    "name": "3.16.4gS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.4gS",
                      "product_id": "CSAFPID-222693"
                    }
                  },
                  {
                    "name": "3.16.5S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.5S",
                      "product_id": "CSAFPID-222694"
                    }
                  },
                  {
                    "name": "3.16.4cS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.4cS",
                      "product_id": "CSAFPID-222925"
                    }
                  },
                  {
                    "name": "3.16.4dS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.4dS",
                      "product_id": "CSAFPID-223252"
                    }
                  },
                  {
                    "name": "3.16.4eS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.4eS",
                      "product_id": "CSAFPID-224702"
                    }
                  },
                  {
                    "name": "3.16.6S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.6S",
                      "product_id": "CSAFPID-225099"
                    }
                  },
                  {
                    "name": "3.16.5aS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.5aS",
                      "product_id": "CSAFPID-225466"
                    }
                  },
                  {
                    "name": "3.16.5bS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.16.5bS",
                      "product_id": "CSAFPID-225832"
                    }
                  }
                ]
              },
              {
                "name": "3.17S",
                "category": "product_version",
                "branches": [
                  {
                    "name": "3.17.0S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.17.0S",
                      "product_id": "CSAFPID-212411"
                    }
                  },
                  {
                    "name": "3.17.1S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.17.1S",
                      "product_id": "CSAFPID-212412"
                    }
                  },
                  {
                    "name": "3.17.2S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.17.2S",
                      "product_id": "CSAFPID-217234"
                    }
                  },
                  {
                    "name": "3.17.1aS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.17.1aS",
                      "product_id": "CSAFPID-217268"
                    }
                  },
                  {
                    "name": "3.17.3S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.17.3S",
                      "product_id": "CSAFPID-222942"
                    }
                  }
                ]
              },
              {
                "name": "3.18S",
                "category": "product_version",
                "branches": [
                  {
                    "name": "3.18.0aS",
                    "category": "service_pack",
                    "product": {
                      "name": "3.18.0aS",
                      "product_id": "CSAFPID-217270"
                    }
                  },
                  {
                    "name": "3.18.0S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.18.0S",
                      "product_id": "CSAFPID-217271"
                    }
                  },
                  {
                    "name": "3.18.1S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.18.1S",
                      "product_id": "CSAFPID-217272"
                    }
                  },
                  {
                    "name": "3.18.2S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.18.2S",
                      "product_id": "CSAFPID-217273"
                    }
                  },
                  {
                    "name": "3.18.3S",
                    "category": "service_pack",
                    "product": {
                      "name": "3.18.3S",
                      "product_id": "CSAFPID-226078"
                    }
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2017-6627",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCup10024"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCva95506"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCve64219"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvc96281"
        }
      ],
      "notes": [
        {
          "category": "other",
          "title": "Affected Product Comprehensiveness",
          "text": "Complete."
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-2097",
          "CSAFPID-206178",
          "CSAFPID-206180",
          "CSAFPID-206181",
          "CSAFPID-206191",
          "CSAFPID-206192",
          "CSAFPID-206193",
          "CSAFPID-210079",
          "CSAFPID-210081",
          "CSAFPID-212268",
          "CSAFPID-212408",
          "CSAFPID-212411",
          "CSAFPID-212412",
          "CSAFPID-213476",
          "CSAFPID-213477",
          "CSAFPID-213478",
          "CSAFPID-213635",
          "CSAFPID-213700",
          "CSAFPID-213776",
          "CSAFPID-213777",
          "CSAFPID-213778",
          "CSAFPID-213779",
          "CSAFPID-217234",
          "CSAFPID-217264",
          "CSAFPID-217265",
          "CSAFPID-217266",
          "CSAFPID-217267",
          "CSAFPID-217268",
          "CSAFPID-217270",
          "CSAFPID-217271",
          "CSAFPID-217272",
          "CSAFPID-217273",
          "CSAFPID-220993",
          "CSAFPID-222257",
          "CSAFPID-222693",
          "CSAFPID-222694",
          "CSAFPID-222925",
          "CSAFPID-222942",
          "CSAFPID-223252",
          "CSAFPID-224702",
          "CSAFPID-225099",
          "CSAFPID-225466",
          "CSAFPID-225832",
          "CSAFPID-226078"
        ]
      },
      "release_date": "2017-09-06T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-206178",
            "CSAFPID-206180",
            "CSAFPID-206181",
            "CSAFPID-206191",
            "CSAFPID-206192",
            "CSAFPID-206193",
            "CSAFPID-210079",
            "CSAFPID-210081",
            "CSAFPID-212268",
            "CSAFPID-212408",
            "CSAFPID-212411",
            "CSAFPID-212412",
            "CSAFPID-213476",
            "CSAFPID-213477",
            "CSAFPID-213478",
            "CSAFPID-213635",
            "CSAFPID-213700",
            "CSAFPID-213776",
            "CSAFPID-213777",
            "CSAFPID-213778",
            "CSAFPID-213779",
            "CSAFPID-217234",
            "CSAFPID-217264",
            "CSAFPID-217265",
            "CSAFPID-217266",
            "CSAFPID-217267",
            "CSAFPID-217268",
            "CSAFPID-217270",
            "CSAFPID-217271",
            "CSAFPID-217272",
            "CSAFPID-217273",
            "CSAFPID-220993",
            "CSAFPID-222257",
            "CSAFPID-222693",
            "CSAFPID-222694",
            "CSAFPID-222925",
            "CSAFPID-222942",
            "CSAFPID-223252",
            "CSAFPID-224702",
            "CSAFPID-225099",
            "CSAFPID-225466",
            "CSAFPID-225832",
            "CSAFPID-226078",
            "CSAFPID-2097"
          ],
          "url": "https://software.cisco.com"
        },
        {
          "category": "workaround",
          "details": "To work around this vulnerability, administrators can set a maximum hold queue value that is greater than 250 for all device interfaces. The following example shows how to set the value to 350 by using the hold queue in interface configuration command:\r\n\r\n\r\nRouter# configure terminal\r\nRouter(config)# interface gigabitEthernet 1  Router(config-if)# hold-queue 350 in\r\n\r\nAdministrators can also configure an access-control list (ACL) that blocks UDP packets with a destination port of 0 and apply the ACL to all device interfaces, for example:\r\n\r\n\r\nExtended IP access list 180\r\n    10 deny udp any any eq 0",
          "product_ids": [
            "CSAFPID-2097",
            "CSAFPID-206178",
            "CSAFPID-206180",
            "CSAFPID-206181",
            "CSAFPID-206191",
            "CSAFPID-206192",
            "CSAFPID-206193",
            "CSAFPID-210079",
            "CSAFPID-210081",
            "CSAFPID-212268",
            "CSAFPID-212408",
            "CSAFPID-212411",
            "CSAFPID-212412",
            "CSAFPID-213476",
            "CSAFPID-213477",
            "CSAFPID-213478",
            "CSAFPID-213635",
            "CSAFPID-213700",
            "CSAFPID-213776",
            "CSAFPID-213777",
            "CSAFPID-213778",
            "CSAFPID-213779",
            "CSAFPID-217234",
            "CSAFPID-217264",
            "CSAFPID-217265",
            "CSAFPID-217266",
            "CSAFPID-217267",
            "CSAFPID-217268",
            "CSAFPID-217270",
            "CSAFPID-217271",
            "CSAFPID-217272",
            "CSAFPID-217273",
            "CSAFPID-220993",
            "CSAFPID-222257",
            "CSAFPID-222693",
            "CSAFPID-222694",
            "CSAFPID-222925",
            "CSAFPID-222942",
            "CSAFPID-223252",
            "CSAFPID-224702",
            "CSAFPID-225099",
            "CSAFPID-225466",
            "CSAFPID-225832",
            "CSAFPID-226078"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-2097",
            "CSAFPID-206178",
            "CSAFPID-206180",
            "CSAFPID-206181",
            "CSAFPID-206191",
            "CSAFPID-206192",
            "CSAFPID-206193",
            "CSAFPID-210079",
            "CSAFPID-210081",
            "CSAFPID-212268",
            "CSAFPID-212408",
            "CSAFPID-212411",
            "CSAFPID-212412",
            "CSAFPID-213476",
            "CSAFPID-213477",
            "CSAFPID-213478",
            "CSAFPID-213635",
            "CSAFPID-213700",
            "CSAFPID-213776",
            "CSAFPID-213777",
            "CSAFPID-213778",
            "CSAFPID-213779",
            "CSAFPID-217234",
            "CSAFPID-217264",
            "CSAFPID-217265",
            "CSAFPID-217266",
            "CSAFPID-217267",
            "CSAFPID-217268",
            "CSAFPID-217270",
            "CSAFPID-217271",
            "CSAFPID-217272",
            "CSAFPID-217273",
            "CSAFPID-220993",
            "CSAFPID-222257",
            "CSAFPID-222693",
            "CSAFPID-222694",
            "CSAFPID-222925",
            "CSAFPID-222942",
            "CSAFPID-223252",
            "CSAFPID-224702",
            "CSAFPID-225099",
            "CSAFPID-225466",
            "CSAFPID-225832",
            "CSAFPID-226078"
          ]
        }
      ],
      "title": "Cisco IOS and IOS XE Software UDP Denial of Service Vulnerability"
    }
  ]
}