{
  "affected": [],
  "aliases": [
    "CVE-2022-20731"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-665"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-04-15T15:15:00Z",
    "severity": "HIGH"
  },
  "details": "Multiple vulnerabilities that affect Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches could allow an attacker to execute persistent code at boot time or to permanently prevent the device from booting, resulting in a permanent denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.",
  "id": "GHSA-r38r-g64f-728h",
  "modified": "2022-05-17T00:00:54Z",
  "published": "2022-04-16T00:00:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-20731"
    },
    {
      "type": "WEB",
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cdb-cmicr-vulns-KJjFtNb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

{
  "GSD": {
    "alias": "CVE-2022-20731",
    "description": "Multiple vulnerabilities that affect Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches could allow an attacker to execute persistent code at boot time or to permanently prevent the device from booting, resulting in a permanent denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.",
    "id": "GSD-2022-20731"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2022-20731"
      ],
      "details": "Multiple vulnerabilities that affect Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches could allow an attacker to execute persistent code at boot time or to permanently prevent the device from booting, resulting in a permanent denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.",
      "id": "GSD-2022-20731",
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    }
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        "DATE_PUBLIC": "2022-04-13T16:00:00",
        "ID": "CVE-2022-20731",
        "STATE": "PUBLIC",
        "TITLE": "Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches Vulnerabilities"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
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                "product_data": [
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                    "product_name": "Cisco IOS ROMMON Software ",
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                          "version_value": "n/a"
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          }
        ]
      },
      "exploit": [
        {
          "lang": "eng",
          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory. "
        }
      ],
      "impact": {
        "cvss": {
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          "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H ",
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          }
        ]
      },
      "source": {
        "advisory": "cisco-sa-cdb-cmicr-vulns-KJjFtNb",
        "defect": [
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            "CSCvz02634",
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            "CSCvz57636"
          ]
        ],
        "discovery": "INTERNAL"
      }
    },
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            "children": [
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                    "cpe_name": [],
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                  },
                  {
                    "cpe23Uri": "cpe:2.3:o:cisco:catalyst_digital_building_series_switches_firmware:*:*:*:*:*:*:*:*",
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            }
          ]
        },
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              ],
              "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cdb-cmicr-vulns-KJjFtNb"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 7.2,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 10.0,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
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        },
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            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
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      "lastModifiedDate": "2022-05-16T18:41Z",
      "publishedDate": "2022-04-15T15:15Z"
    }
  }
}

{
  "document": {
    "acknowledgments": [
      {
        "summary": "These vulnerabilities were found during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "Multiple vulnerabilities that affect Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches could allow an attacker to execute persistent code at boot time or to permanently prevent the device from booting, resulting in a permanent denial of service (DoS) condition.\r\n\r\nFor more information about these vulnerabilities, see the Details [\"#details\"] section of this advisory.\r\n\r\nCisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.\r\n\r\nThis advisory is available at the following link:\r\nhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cdb-cmicr-dos-KJjFtNb [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cdb-cmicr-dos-KJjFtNb\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "These vulnerabilities affect the following Cisco products if they are running a release of Cisco IOS Software that contains Cisco Boot Loader Version 15.2(7r)E2:\r\n\r\nCatalyst Digital Building Series Switches with product identifiers (PIDs) CDB-8P and CDB-8U (CVE-2022-20661 and CVE-2022-20731)\r\nCatalyst Micro Switches with PIDs CMICR-4PS and CMICR-4PC (CVE-2022-20661)\r\n\r\nFor information about which Cisco IOS Software releases contain the fixed boot loader, see the Fixed Software [\"#fs\"] section of this advisory.\r\n  Determine the Boot Loader Version\r\nTo determine the boot loader version, use the show version | include BOOTLDR command on the device CLI.\r\n\r\nCisco Catalyst Digital Building Series Switches\r\n\r\nThe following example shows the output of the show version | include BOOTLDR command on a Cisco Catalyst Digital Building Series Switch that is running Cisco Boot Loader Version 15.2(7r)E2:\r\n\r\n\r\ncdb\u003e show version | include BOOTLDR\r\nBOOTLDR: CDB Boot Loader (CDB-HBOOT-M) Version 15.2(7r)E2, RELEASE SOFTWARE (fc2)\r\n\r\nAny other output indicates that the device is not affected by these vulnerabilities.\r\n\r\nCisco Catalyst Micro Switches\r\n\r\nThe following example shows the output of the show version | include BOOTLDR command on a Cisco Catalyst Micro Switch that is running Cisco Boot Loader Version 15.2(7r)E2:\r\n\r\n\r\ncmicr\u003e show version | include BOOTLDR\r\nBOOTLDR: CMICR Boot Loader (CMICR-HBOOT-M) Version 15.2(7r)E2, RELEASE SOFTWARE (fc2)\r\n\r\nAny other output indicates that the device is not affected by these vulnerabilities.",
        "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 these vulnerabilities do not affect the following Cisco products:\r\n\r\nCatalyst Micro Switch with PID CMICR-4PT\r\nIOS XE Software\r\nIOS XR Software\r\nMeraki products\r\nNX-OS Software",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "The vulnerabilities are not dependent on one another. Exploitation of one of the vulnerabilities is not required to exploit the other vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerability.\r\n\r\nDetails about the vulnerabilities are as follows:\r\n\r\nCVE-2022-20731: Cisco Catalyst Digital Building Series Switches Boot Loader Arbitrary Code Execution Vulnerability\r\n\r\nA vulnerability in the boot loader of Cisco Catalyst Digital Building Series Switches could allow an authenticated, local attacker with level 15 privileges or an unauthenticated attacker with physical access to an affected device to execute persistent code at boot time and break the chain of trust.\r\n\r\nThis vulnerability exists because Secure Boot is not properly enabled. An attacker could exploit this vulnerability by loading unsigned code. A successful exploit could allow the attacker to execute persistent code on the underlying operating system.\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\nBug ID(s): CSCvz34674 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz34674\"]\r\nCVE ID: CVE-2022-20731\r\nSecurity Impact Rating (SIR): High\r\nCVSS Base Score: 6.8\r\nCVSS Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\r\n\r\nCVE-2022-20661: Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches Permanent Denial of Service Vulnerability\r\n\r\nA vulnerability in the boot loader of Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches could allow an unauthenticated attacker with physical access to an affected device to permanently prevent the device from booting, resulting in a permanent denial of service (DoS) condition.\r\n\r\nThis vulnerability exists because the affected devices have an internal Cisco development boot loader that includes capabilities beyond those present in a normal boot loader. An attacker with physical access to an affected device could exploit this vulnerability by causing the device to reboot, breaking into the ROM monitor (ROMMON) during the boot cycle, and then executing specific commands at the ROMMON prompt. A successful exploit could allow the attacker to irrecoverably corrupt the boot ROM in such a way that the device will be unable to boot correctly during the next boot cycle. The device will continue to operate normally until it is reloaded or power-cycled.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\nBug ID(s): CSCvz02634 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz02634\"], CSCvz30892 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz30892\"], CSCvz42624 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz42624\"], CSCvz57636 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz57636\"]\r\nCVE ID: CVE-2022-20661\r\nSecurity Impact Rating (SIR): Medium\r\nCVSS Base Score: 4.6\r\nCVSS Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "title": "Details"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address these vulnerabilities.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has released free software updates [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#ssu\"] that address the vulnerabilities described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels.\r\n\r\nCustomers 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\nThe Cisco Support and Downloads page [\"https://www.cisco.com/c/en/us/support/index.html\"] on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool.\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      Fixed Releases\r\nIn the following table(s), the left column lists Cisco software releases. The right column indicates whether a release is affected by the vulnerabilities described in this advisory and the first release that includes the fix for these vulnerabilities. Customers are advised to upgrade to an appropriate fixed software release [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"] as indicated in this section.\r\n\r\nCatalyst Digital Building Series Switches (CVE-2022-20661 and CVE-2022-20713)\r\n        Cisco IOS Software Release  First Fixed Release          15.2(5)EX  Migrate to a fixed release.      15.2(7)E and earlier  15.2(7)E5\r\nCatalyst Micro Switches (CVE-2022-20661)\r\n        Cisco IOS Software Release  First Fixed Release          15.2(7)E and earlier  15.2(7)E5      15.2(8)E  15.2(8)E1\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 vulnerabilities that are described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "These vulnerabilities were found during internal security testing.",
        "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 Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches Vulnerabilities",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cdb-cmicr-vulns-KJjFtNb"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cdb-cmicr-dos-KJjFtNb",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cdb-cmicr-dos-KJjFtNb"
      },
      {
        "category": "external",
        "summary": "CSCvz34674",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz34674"
      },
      {
        "category": "external",
        "summary": "CSCvz02634",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz02634"
      },
      {
        "category": "external",
        "summary": "CSCvz30892",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz30892"
      },
      {
        "category": "external",
        "summary": "CSCvz42624",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz42624"
      },
      {
        "category": "external",
        "summary": "CSCvz57636",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz57636"
      },
      {
        "category": "external",
        "summary": "free software updates",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#ssu"
      },
      {
        "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": "Cisco\u0026nbsp;Support and Downloads page",
        "url": "https://www.cisco.com/c/en/us/support/index.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"
      }
    ],
    "title": "Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches Vulnerabilities",
    "tracking": {
      "current_release_date": "2022-04-13T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T23:14:37+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-cdb-cmicr-vulns-KJjFtNb",
      "initial_release_date": "2022-04-13T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2022-04-13T15:41:19+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 IOS ROMMON Software",
            "product": {
              "name": "Cisco IOS ROMMON Software ",
              "product_id": "CSAFPID-279685"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2022-20661",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvz02634"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvz42624"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvz57636"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvz30892"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-279685"
        ]
      },
      "release_date": "2022-04-13T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-279685"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.6,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-279685"
          ]
        }
      ],
      "title": "Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches Permanent Denial of Service Vulnerability"
    },
    {
      "cve": "CVE-2022-20731",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvz34674"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-279685"
        ]
      },
      "release_date": "2022-04-13T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-279685"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-279685"
          ]
        }
      ],
      "title": "Cisco Catalyst Digital Building Series Switches Bootloader Arbitrary Code Execution Vulnerability"
    }
  ]
}