{
  "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 egress packet processing function of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers and Cisco Network Convergence System (NCS) 5000 Series Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThe vulnerability is due to improper resource allocation when an affected device processes network traffic in software switching mode. An attacker could exploit this vulnerability by sending specific streams of Layer 2 or Layer 3 protocol data units (PDUs) to an affected device. A successful exploit could cause the affected device to run out of buffer resources, which could make the device unable to process or forward traffic, resulting in a DoS condition. The device would need to be restarted to regain functionality.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco ASR 9000 Series Aggregation Services Routers and Cisco NCS 5000 Series Routers if they are running a vulnerable release of Cisco IOS XR Software.\r\n\r\nFor information about which Cisco software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.",
        "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\nCarrier Routing System (CRS)\r\nIOS Software\r\nIOS XE Software\r\nIOS XRv 9000 Router\r\nNetwork Convergence System (NCS) 520 Series Routers\r\nNCS 540 Series Routers\r\nNCS 560 Series Routers\r\nNCS 5500 Series\r\nNCS 6000 Series Routers\r\nNX-OS Software",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "Exploitation of this vulnerability can result in the exhaustion of buffer resources. When a device is experiencing buffer resources exhaustion, the following message may be seen in the system logs:\r\n\r\n\r\n%PKT_INFRA-spp-4-PKT_ALLOC_FAIL : Failed to allocate n packets for sending\r\n\r\nThis error message indicates that the device is not able to allocate buffer resources and forward network traffic in software switching mode. However, buffer resource exhaustion may happen for a reason other than the exploitation of this vulnerability. Customers are advised to contact their support organization to review the error messages and determine whether the device has been compromised by an exploitation of this vulnerability.",
        "title": "Indicators of Compromise"
      },
      {
        "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      ASR 9000 Series Aggregation Services Routers: CSCvv09115 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv09115\"]\r\nCisco fixed this vulnerability in Cisco IOS XR Software releases 6.7.2, 7.1.2, and 7.1.3.\r\n  NCS 5000 Series Routers: CSCvw46865 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw46865\"]\r\nCisco fixed this vulnerability in Cisco IOS XR Software Release 7.1.3.\r\n\r\nCisco also released the following SMUs to address this vulnerability. Customers who require SMUs for platforms or releases that are not listed are advised to contact their support organization.\r\n\r\nThe following tables provide the SMU name for each release based on platform.\r\n\r\nASR9K-PX\r\n        Cisco IOS XR Software Release  SMU Name          5.3.2  asr9k-px-5.3.2.CSCvv09115      5.3.3  asr9k-px-5.3.3.CSCvv09115      5.3.4  asr9k-px-5.3.4.CSCvv09115      6.1.4  asr9k-px-6.1.4.CSCvv09115      6.2.1  asr9k-px-6.2.1.CSCvv09115      6.2.2  asr9k-px-6.2.2.CSCvv09115      6.2.3  asr9k-px-6.2.3.CSCvv09115      6.3.2  asr9k-px-6.3.2.CSCvv09115      6.3.3  asr9k-px-6.3.3.CSCvv09115      6.4.2  asr9k-px-6.4.2.CSCvv09115      6.5.2  asr9k-px-6.5.2.CSCvv09115      6.5.3  asr9k-px-6.5.3.CSCvv09115      6.6.2  asr9k-px-6.6.2.CSCvv09115      6.6.3  asr9k-px-6.6.3.CSCvv09115\r\nASR9K-X64\r\n        Cisco IOS XR Software Release  SMU Name          6.2.3  asr9k-x64-6.2.3.CSCvv09115      6.3.3  asr9k-x64-6.3.3.CSCvv09115      6.4.1  asr9k-x64-6.4.1.CSCvv09115      6.4.2  asr9k-x64-6.4.2.CSCvv09115      6.5.3  asr9k-x64-6.5.3.CSCvv09115      6.6.2  asr9k-x64-6.6.2.CSCvv09115      6.6.3  asr9k-x64-6.6.3.CSCvv09115      7.0.2  asr9k-x64-7.0.2.CSCvv09115      7.1.15  asr9k-x64-7.1.15.CSCvv09115\r\nNCS5K\r\n        Cisco IOS XR Software Release  SMU Name          6.5.3  ncs5k-6.5.3.CSCvw46865      6.6.3  ncs5k-6.6.3.CSCvw46865      7.1.2  ncs5k-7.1.2.CSCvw46865",
        "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": "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 XR Software Slow Path Forwarding Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-cp-dos-ej8VB9QY"
      },
      {
        "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": "CSCvv09115",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv09115"
      },
      {
        "category": "external",
        "summary": "CSCvw46865",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw46865"
      }
    ],
    "title": "Cisco IOS XR Software Slow Path Forwarding Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2021-02-10T16:47:03+00:00",
      "generator": {
        "date": "2024-05-10T22:56:20+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-xr-cp-dos-ej8VB9QY",
      "initial_release_date": "2020-11-10T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2020-11-10T15:56:31+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        },
        {
          "date": "2020-11-11T16:02:17+00:00",
          "number": "1.1.0",
          "summary": "Added SMU information."
        },
        {
          "date": "2020-11-13T16:33:06+00:00",
          "number": "1.2.0",
          "summary": "Summary update."
        },
        {
          "date": "2020-11-16T15:29:06+00:00",
          "number": "1.3.0",
          "summary": "Added SMU information. Updated the release date for version 1.2."
        },
        {
          "date": "2020-11-30T17:49:33+00:00",
          "number": "1.4.0",
          "summary": "Added SMU information."
        },
        {
          "date": "2020-12-01T13:01:38+00:00",
          "number": "1.5.0",
          "summary": "Added SMU information."
        },
        {
          "date": "2021-02-10T16:47:03+00:00",
          "number": "2.0.0",
          "summary": "Added Cisco Network Convergence System (NCS) 5000 Series Routers as an affected product. Added products that have been confirmed not vulnerable. Added fixed software and SMU releases for Cisco NCS 5000 Series Routers."
        }
      ],
      "status": "final",
      "version": "2.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_family",
            "name": "Cisco IOS XR Software",
            "product": {
              "name": "Cisco IOS XR Software ",
              "product_id": "CSAFPID-5834"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-26070",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvv09115"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvw46865"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-5834"
        ]
      },
      "release_date": "2020-11-10T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-5834"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-5834"
          ]
        }
      ],
      "title": "Cisco IOS XR Software for Cisco ASR 9000 Slow Path Forwarding Denial Of Service Vulnerability"
    }
  ]
}