{
  "document": {
    "acknowledgments": [
      {
        "summary": "Cisco would like to thank partner and exploit developer Ken Pyle of CYBIR (CYBIR.com) for reporting this vulnerability."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the web-based management interface of Cisco Small Business 200 Series Smart Switches, Cisco Small Business 300 Series Managed Switches, and Cisco Small Business 500 Series Stackable Managed Switches could allow an unauthenticated, remote attacker to render the web-based management interface unusable, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to cause a permanent invalid redirect for requests sent to the web-based management interface of the device, resulting in a DoS condition.\r\n\r\nThere are no workarounds that address this vulnerability.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected the following Cisco products:\r\n\r\nSmall Business 200 Series Smart Switches\r\nSmall Business 300 Series Managed Switches\r\nSmall Business 500 Series Stackable Managed Switches\r\n\r\nSee the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.",
        "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\n220 Series Smart Switches\r\n250 Series Smart Switches\r\n350 Series Managed Switches\r\n350X Series Stackable Managed Switches\r\n550X Series Stackable Managed Switches\r\nBusiness 220 Series Smart Switches\r\nBusiness 250 Series Smart Switches\r\nBusiness 350 Series Managed Switches\r\nESW2 Series Advanced Switches",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has not released and will not release firmware updates to address the vulnerability described in this advisory. The Cisco Small Business 200 Series Smart Switches, Cisco Small Business 300 Series Managed Switches, and Cisco Small Business 500 Series Stackable Managed Switches have entered the end-of-life process. Customers are advised to refer to the end-of-life notices for these products:\r\n\r\nEnd-of-Sale and End-of-Life Announcement for the Cisco Small Business 200 Series Smart Switches [\"https://www.cisco.com/c/en/us/products/collateral/switches/small-business-smart-switches/eos-eol-notice-c51-740541.html\"]\r\n\r\nEnd-of-Sale and End-of-Life Announcements for the Cisco Small Business 300 Series Managed Switches [\"https://www.cisco.com/c/en/us/products/switches/small-business-300-series-managed-switches/eos-eol-notice-listing.html\"]\r\n\r\nEnd-of-Sale and End-of-Life Announcements for the Cisco 500 Series Stackable Managed Switches [\"https://www.cisco.com/c/en/us/products/switches/small-business-500-series-stackable-managed-switches/eos-eol-notice-listing.html\"]\r\n\r\nCustomers are encouraged to migrate to the Cisco Business 250 Series Smart Switches or the Cisco Business 350 Series Managed Switches.\r\n\r\nWhen considering a device migration, 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 new switch will be sufficient for their network needs and that current hardware and software configurations will continue to be supported properly by the new product. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.\r\n\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.",
        "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 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 partner and exploit developer Ken Pyle of CYBIR (CYBIR.com) 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 Small Business 200, 300, and 500 Series Switches Web-Based Management Interface Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-smb-switches-web-dos-xMyFFkt8"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "End-of-Sale and End-of-Life Announcement for the Cisco\u0026nbsp;Small Business 200 Series Smart Switches",
        "url": "https://www.cisco.com/c/en/us/products/collateral/switches/small-business-smart-switches/eos-eol-notice-c51-740541.html"
      },
      {
        "category": "external",
        "summary": "End-of-Sale and End-of-Life Announcements for the Cisco\u0026nbsp;Small Business 300 Series Managed Switches",
        "url": "https://www.cisco.com/c/en/us/products/switches/small-business-300-series-managed-switches/eos-eol-notice-listing.html"
      },
      {
        "category": "external",
        "summary": "End-of-Sale and End-of-Life Announcements for the Cisco\u0026nbsp;500 Series Stackable Managed Switches",
        "url": "https://www.cisco.com/c/en/us/products/switches/small-business-500-series-stackable-managed-switches/eos-eol-notice-listing.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Security Advisories page",
        "url": "https://www.cisco.com/go/psirt"
      }
    ],
    "title": "Cisco Small Business 200, 300, and 500 Series Switches Web-Based Management Interface Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2021-11-03T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T23:11:40+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-smb-switches-web-dos-xMyFFkt8",
      "initial_release_date": "2021-11-03T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2021-11-03T15:46:48+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_family",
            "name": "Cisco Small Business Smart and Managed Switches",
            "product": {
              "name": "Cisco Small Business Smart and Managed Switches ",
              "product_id": "CSAFPID-278027"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-40127",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvz62174"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-278027"
        ]
      },
      "release_date": "2021-11-03T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-278027"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-278027"
          ]
        }
      ],
      "title": "Cisco Small Business 200, 300, and 500 Series Switches Web-based Management Interface Denial of Service Vulnerability"
    }
  ]
}