{
  "GSD": {
    "alias": "CVE-2021-1591",
    "description": "A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface.",
    "id": "GSD-2021-1591"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-1591"
      ],
      "details": "A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface.",
      "id": "GSD-2021-1591",
      "modified": "2023-12-13T01:23:22.874985Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "DATE_PUBLIC": "2021-08-25T16:00:00",
        "ID": "CVE-2021-1591",
        "STATE": "PUBLIC",
        "TITLE": "Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability"
      },
      "affects": {
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          "vendor_data": [
            {
              "product": {
                "product_data": [
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                          "version_value": "n/a"
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      "description": {
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            "value": "A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface."
          }
        ]
      },
      "exploit": [
        {
          "lang": "eng",
          "value": "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. "
        }
      ],
      "impact": {
        "cvss": {
          "baseScore": "5.8",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N ",
          "version": "3.0"
        }
      },
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        "problemtype_data": [
          {
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              {
                "lang": "eng",
                "value": "CWE-284"
              }
            ]
          }
        ]
      },
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        "reference_data": [
          {
            "name": "20210825 Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability",
            "refsource": "CISCO",
            "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nexus-acl-vrvQYPVe"
          }
        ]
      },
      "source": {
        "advisory": "cisco-sa-nexus-acl-vrvQYPVe",
        "defect": [
          [
            "CSCvx65385"
          ]
        ],
        "discovery": "INTERNAL"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [
              {
                "children": [],
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                "children": [],
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                  }
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          "ID": "CVE-2021-1591"
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        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
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                  "lang": "en",
                  "value": "NVD-CWE-Other"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "20210825 Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability",
              "refsource": "CISCO",
              "tags": [
                "Patch",
                "Vendor Advisory"
              ],
              "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nexus-acl-vrvQYPVe"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2022-07-08T18:25Z",
      "publishedDate": "2021-08-25T20:15Z"
    }
  }
}

{
  "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 EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device.\r\n\r\nThis vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface.\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 available at the following link:\r\nhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nexus-acl-vrvQYPVe [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nexus-acl-vrvQYPVe\"]\r\n\r\nThis advisory is part of the August 2021 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2021 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74640\"].",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected Cisco Nexus 9500 Series Switches if they were running a vulnerable release of Cisco NX-OS Software and had port channels configured with ACLs enabled. This vulnerability is more likely to be exploited in port channels that have member interfaces configured with subinterfaces.\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\nFirepower 1000 Series\r\nFirepower 2100 Series\r\nFirepower 4100 Series\r\nFirepower 9300 Security Appliances\r\nMDS 9000 Series Multilayer Switches\r\nNexus 1000 Virtual Edge for VMware vSphere\r\nNexus 1000V Switch for Microsoft Hyper-V\r\nNexus 1000V Switch for VMware vSphere\r\nNexus 3000 Series Switches\r\nNexus 5500 Platform Switches\r\nNexus 5600 Platform Switches\r\nNexus 6000 Series Switches\r\nNexus 7000 Series Switches\r\nNexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode\r\nNexus 9000 Series Switches in standalone NX-OS mode, other than the models referenced in Vulnerable Products [\"#vp\"]\r\nUCS 6200 Series Fabric Interconnects\r\nUCS 6300 Series Fabric Interconnects\r\nUCS 6400 Series Fabric Interconnects",
        "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 NX-OS Software\r\nTo help customers determine their exposure to vulnerabilities in Cisco NX-OS Software, Cisco provides the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] to identify any Cisco Security Advisories that impact a specific Cisco NX-OS 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 described in all the advisories identified (\u201cCombined First Fixed\u201d).\r\n\r\nCustomers can use the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] to search advisories in the following ways:\r\n\r\nChoose the software, platform, and one or more releases\r\nUpload a .txt file that includes a list of specific releases\r\nEnter the output of the show version command\r\n\r\nAfter initiating a search, customers can customize the search to include all Cisco Security Advisories or one or more specific advisories.\r\n\r\nCustomers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by choosing the Cisco NX-OS Software and platform and then entering a release\u2014for example, 7.0(3)I7(5) for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software in ACI mode:\r\n    Cisco NX-OS Software  Cisco NX-OS Software in ACI Mode    MDS 9000 Series Multilayer Switches  Nexus 1000V Series Switches  Nexus 3000 Series Switches  Nexus 5000 Series Switches  Nexus 6000 Series Switches  Nexus 7000 Series Switches  Nexus 9000 Series Switches\r\n\r\n\r\n\r\n\r\nBy default, the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker and check the Medium check box in the drop-down list under Impact Rating when customizing a search.\r\n      Additional Resources\r\nFor help determining the best Cisco NX-OS Software release for a Cisco Nexus Switch, see the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance.\r\n\r\n\r\nCisco MDS Series Switches [\"https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/b_MDS_NX-OS_Recommended_Releases.html\"]\r\nCisco Nexus 1000V for VMware Switch [\"http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus1000/sw/recommended_releases/b_Cisco_N1KV_VMware_MinRecommendedReleases.html\"]\r\nCisco Nexus 3000 Series Switches [\"http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3000/sw/recommended_release/b_Minimum_and_Recommended_Cisco_NX-OS_Releases_for_Cisco_Nexus_3000_Series_Switches.html\"]\r\nCisco Nexus 5500 Platform Switches [\"http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/release/recommended_releases/n5500_recommended_nx-os_releases.html\"]\r\nCisco Nexus 5600 Platform Switches [\"https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5600/sw/release/recommended_releases/n5600_recommended_nx-os_releases.html\"]\r\nCisco Nexus 6000 Series Switches [\"http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus6000/sw/release/recommended_releases/recommended_nx-os_releases.html\"]\r\nCisco Nexus 7000 Series Switches [\"http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx-os/recommended_releases/recommended_nx-os_releases.html\"]\r\nCisco Nexus 9000 Series Switches [\"http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/recommended_release/b_Minimum_and_Recommended_Cisco_NX-OS_Releases_for_Cisco_Nexus_9000_Series_Switches.html\"]\r\nCisco Nexus 9000 Series ACI-Mode Switches [\"https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/recommended-release/b_Recommended_Cisco_ACI_Releases.html\"]\r\n\r\nTo determine the best release for Cisco UCS Software, see the Recommended Releases documents in the release notes for the device.",
        "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": "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 Nexus 9500 Series Switches Access Control List Bypass Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nexus-acl-vrvQYPVe"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: August 2021 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74640"
      },
      {
        "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-nexus-acl-vrvQYPVe",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nexus-acl-vrvQYPVe"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Event Response: August 2021 Cisco\u0026nbsp;FXOS and NX-OS Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74640"
      },
      {
        "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": "Cisco\u0026nbsp;Software Checker",
        "url": "https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Software Checker",
        "url": "https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Software Checker",
        "url": "https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;MDS Series Switches",
        "url": "https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/b_MDS_NX-OS_Recommended_Releases.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Nexus 1000V for VMware Switch",
        "url": "http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus1000/sw/recommended_releases/b_Cisco_N1KV_VMware_MinRecommendedReleases.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Nexus 3000 Series Switches",
        "url": "http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3000/sw/recommended_release/b_Minimum_and_Recommended_Cisco_NX-OS_Releases_for_Cisco_Nexus_3000_Series_Switches.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Nexus 5500 Platform Switches",
        "url": "http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/release/recommended_releases/n5500_recommended_nx-os_releases.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Nexus 5600 Platform Switches",
        "url": "https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5600/sw/release/recommended_releases/n5600_recommended_nx-os_releases.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Nexus 6000 Series Switches",
        "url": "http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus6000/sw/release/recommended_releases/recommended_nx-os_releases.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Nexus 7000 Series Switches",
        "url": "http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx-os/recommended_releases/recommended_nx-os_releases.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Nexus 9000 Series Switches",
        "url": "http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/recommended_release/b_Minimum_and_Recommended_Cisco_NX-OS_Releases_for_Cisco_Nexus_9000_Series_Switches.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Nexus 9000 Series ACI-Mode Switches",
        "url": "https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/recommended-release/b_Recommended_Cisco_ACI_Releases.html"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2021-08-25T16:00:00+00:00",
      "generator": {
        "date": "2022-10-22T03:11:17+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-nexus-acl-vrvQYPVe",
      "initial_release_date": "2021-08-25T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2021-08-25T15:49:14+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
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      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
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                      "name": "9.3(3)",
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                    }
                  },
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                    "category": "service_pack",
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                    }
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                  {
                    "category": "service_pack",
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                    }
                  },
                  {
                    "category": "service_pack",
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                    }
                  },
                  {
                    "category": "service_pack",
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                    "product": {
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                      "product_id": "CSAFPID-280940"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.3(7)",
                    "product": {
                      "name": "9.3(7)",
                      "product_id": "CSAFPID-281984"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.3(7k)",
                    "product": {
                      "name": "9.3(7k)",
                      "product_id": "CSAFPID-282019"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.3"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "10.1(1)",
                    "product": {
                      "name": "10.1(1)",
                      "product_id": "CSAFPID-281488"
                    }
                  }
                ],
                "category": "product_version",
                "name": "10.1"
              }
            ],
            "category": "product_family",
            "name": "Cisco NX-OS Software"
          },
          {
            "category": "product_family",
            "name": "Cisco NX-OS Software",
            "product": {
              "name": "Cisco NX-OS Software ",
              "product_id": "CSAFPID-80720"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Nexus 9000 Series Switches",
            "product": {
              "name": "Cisco Nexus 9000 Series Switches",
              "product_id": "CSAFPID-265096"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco NX-OS Software 9.3(3) when installed on Cisco Nexus 9000 Series Switches",
          "product_id": "CSAFPID-274557:265096"
        },
        "product_reference": "CSAFPID-274557",
        "relates_to_product_reference": "CSAFPID-265096"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco NX-OS Software 9.3(4) when installed on Cisco Nexus 9000 Series Switches",
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        },
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      },
      {
        "category": "installed_on",
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        },
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        "relates_to_product_reference": "CSAFPID-265096"
      },
      {
        "category": "installed_on",
        "full_product_name": {
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        },
        "product_reference": "CSAFPID-280558",
        "relates_to_product_reference": "CSAFPID-265096"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco NX-OS Software 9.3(5w) when installed on Cisco Nexus 9000 Series Switches",
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        },
        "product_reference": "CSAFPID-280940",
        "relates_to_product_reference": "CSAFPID-265096"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco NX-OS Software 9.3(7) when installed on Cisco Nexus 9000 Series Switches",
          "product_id": "CSAFPID-281984:265096"
        },
        "product_reference": "CSAFPID-281984",
        "relates_to_product_reference": "CSAFPID-265096"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco NX-OS Software 9.3(7k) when installed on Cisco Nexus 9000 Series Switches",
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        },
        "product_reference": "CSAFPID-282019",
        "relates_to_product_reference": "CSAFPID-265096"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco NX-OS Software 10.1(1) when installed on Cisco Nexus 9000 Series Switches",
          "product_id": "CSAFPID-281488:265096"
        },
        "product_reference": "CSAFPID-281488",
        "relates_to_product_reference": "CSAFPID-265096"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-1591",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvx65385"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-274557:265096",
          "CSAFPID-277347:265096",
          "CSAFPID-278882:265096",
          "CSAFPID-280558:265096",
          "CSAFPID-280940:265096",
          "CSAFPID-281488:265096",
          "CSAFPID-281984:265096",
          "CSAFPID-282019:265096",
          "CSAFPID-80720"
        ]
      },
      "release_date": "2021-08-25T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-274557:265096",
            "CSAFPID-277347:265096",
            "CSAFPID-278882:265096",
            "CSAFPID-280558:265096",
            "CSAFPID-280940:265096",
            "CSAFPID-281488:265096",
            "CSAFPID-281984:265096",
            "CSAFPID-282019:265096",
            "CSAFPID-80720"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-274557:265096",
            "CSAFPID-277347:265096",
            "CSAFPID-278882:265096",
            "CSAFPID-280558:265096",
            "CSAFPID-280940:265096",
            "CSAFPID-281488:265096",
            "CSAFPID-281984:265096",
            "CSAFPID-282019:265096",
            "CSAFPID-80720"
          ]
        }
      ],
      "title": "Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2021-1591"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-08-25T20:15:00Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface.",
  "id": "GHSA-7mcq-4g86-cgx3",
  "modified": "2022-07-09T00:00:21Z",
  "published": "2022-05-24T19:12:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1591"
    },
    {
      "type": "WEB",
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nexus-acl-vrvQYPVe"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}