CVE-2019-1977 (GCVE-0-2019-1977)

Vulnerability from cvelistv5 – Published: 2019-08-29 21:50 – Updated: 2024-11-21 19:15
VLAI?
Title
Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability
Summary
A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.
Severity ?
6.8 (Medium)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
Assigner
References
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
Impacted products
Vendor Product Version
Cisco Cisco Nexus 9000 Series Fabric Switches in ACI Affected: unspecified , < 12.2(4M) (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T18:35:51.847Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "20190828 Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability",
            "tags": [
              "vendor-advisory",
              "x_refsource_CISCO",
              "x_transferred"
            ],
            "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2019-1977",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-11-21T18:57:07.380958Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-11-21T19:15:02.726Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Cisco Nexus 9000 Series Fabric Switches in ACI",
          "vendor": "Cisco",
          "versions": [
            {
              "lessThan": "12.2(4M)",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "datePublic": "2019-08-28T00:00:00",
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-371",
              "description": "CWE-371",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2019-08-29T21:50:14",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "20190828 Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability",
          "tags": [
            "vendor-advisory",
            "x_refsource_CISCO"
          ],
          "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos"
        }
      ],
      "source": {
        "advisory": "cisco-sa-20190828-nexus-aci-dos",
        "defect": [
          [
            "CSCvi11291"
          ]
        ],
        "discovery": "INTERNAL"
      },
      "title": "Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "psirt@cisco.com",
          "DATE_PUBLIC": "2019-08-28T16:00:00-0700",
          "ID": "CVE-2019-1977",
          "STATE": "PUBLIC",
          "TITLE": "Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Cisco Nexus 9000 Series Fabric Switches in ACI",
                      "version": {
                        "version_data": [
                          {
                            "affected": "\u003c",
                            "version_affected": "\u003c",
                            "version_value": "12.2(4M)"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Cisco"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism."
            }
          ]
        },
        "exploit": [
          {
            "lang": "en",
            "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": "6.8",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.0"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-371"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "20190828 Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability",
              "refsource": "CISCO",
              "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos"
            }
          ]
        },
        "source": {
          "advisory": "cisco-sa-20190828-nexus-aci-dos",
          "defect": [
            [
              "CSCvi11291"
            ]
          ],
          "discovery": "INTERNAL"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2019-1977",
    "datePublished": "2019-08-29T21:50:14.241461Z",
    "dateReserved": "2018-12-06T00:00:00",
    "dateUpdated": "2024-11-21T19:15:02.726Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "fkie_nvd": {
      "configurations": "[{\"operator\": \"AND\", \"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:cisco:nx-os:12.3\\\\(1h\\\\):*:*:*:*:*:*:*\", \"matchCriteriaId\": \"51A48073-7EB7-4954-8343-5C498681F25F\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:cisco:nx-os:13.1\\\\(2m\\\\):*:*:*:*:*:*:*\", \"matchCriteriaId\": \"970718D9-4789-414B-8ED2-FBF914B4047C\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:cisco:nx-os:13.1\\\\(2o\\\\):*:*:*:*:*:*:*\", \"matchCriteriaId\": \"7C45D91E-5AA4-46B4-9A87-75480AC04732\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:cisco:nx-os:13.1\\\\(2p\\\\):*:*:*:*:*:*:*\", \"matchCriteriaId\": \"973B7EE9-6B18-4D1D-8DEE-3C43D0CEB89C\"}]}, {\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9000:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"8EBEBA5B-5589-417B-BF3B-976083E9FE54\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_93108tc-ex:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"A90184B3-C82F-4CE5-B2AD-97D5E4690871\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_93108tc-fx:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"4AB89849-6DA4-4C9D-BC3F-EE0E41FD1901\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_93120tx:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"07DE6F63-2C7D-415B-8C34-01EC05C062F3\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_93128tx:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"F423E45D-A6DD-4305-9C6A-EAB26293E53A\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_93180lc-ex:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"E952A96A-0F48-4357-B7DD-1127D8827650\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_93180yc-ex:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"F70D81F1-8B12-4474-9060-B4934D8A3873\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_93180yc-fx:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"7349D69B-D8FA-4462-AA28-69DD18A652D9\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9332pq:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"113772B6-E9D2-4094-9468-3F4E1A87D07D\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9336c-fx2:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"F1FC2B1F-232E-4754-8076-CC82F3648730\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9336pq:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"5F1127D2-12C0-454F-91EF-5EE334070D06\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9348gc-fxp:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"17C7E3DB-8E1A-47AD-B1C5-61747DC0CFB9\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9364c:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"63842B25-8C32-4988-BBBD-61E9CB09B4F3\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9372px:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"4364ADB9-8162-451D-806A-B98924E6B2CF\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9372px-e:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"B53BCB42-ED61-4FCF-8068-CB467631C63C\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9372tx:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"49E0371B-FDE2-473C-AA59-47E1269D050F\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9372tx-e:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"489D11EC-5A18-4F32-BC7C-AC1FCEC27222\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9396px:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"1BC5293E-F2B4-46DC-85DA-167EA323FCFD\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9396tx:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"EA022E77-6557-4A33-9A3A-D028E2DB669A\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9504:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"768BE390-5ED5-48A7-9E80-C4DE8BA979B1\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9508:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"DDC2F709-AFBE-48EA-A3A2-DA1134534FB6\"}, {\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:cisco:nexus_9516:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"7E02DC82-0D26-436F-BA64-73C958932B0A\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.\"}, {\"lang\": \"es\", \"value\": \"Una vulnerabilidad dentro de la funcionalidad Endpoint Learning de Cisco Nexus 9000 Series Switches ejecut\\u00e1ndose en el modo Application Centric Infrastructure (ACI), podr\\u00eda permitir a un atacante remoto no autenticado causar una condici\\u00f3n de denegaci\\u00f3n de servicio (DoS) en dispositivo endpoint en determinadas circunstancias. La vulnerabilidad es debido al aprendizaje inapropiado del endpoint cuando los paquetes son recibidos en un puerto espec\\u00edfico desde fuera de la estructura ACI y se destinan hacia un endpoint ubicado en el borde de una bifurcaci\\u00f3n cuando se ha habilitado Disable Remote Endpoint Learning. Esto puede resultar en que se cree una entrada Remote (XR) para el endpoint afectado que se volver\\u00e1 obsoleta si el endpoint migra a un puerto o switch de bifurcaci\\u00f3n. Esto resulta en un tr\\u00e1fico que no alcanza el endpoint afectado hasta que la entrada remota pueda ser reaprendida por otro mecanismo.\"}]",
      "id": "CVE-2019-1977",
      "lastModified": "2024-11-21T04:37:48.753",
      "metrics": "{\"cvssMetricV30\": [{\"source\": \"ykramarz@cisco.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.0\", \"vectorString\": \"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H\", \"baseScore\": 6.8, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"CHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 4.0}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.0\", \"vectorString\": \"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:M/Au:N/C:N/I:N/A:P\", \"baseScore\": 4.3, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"MEDIUM\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 8.6, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2019-08-30T09:15:20.553",
      "references": "[{\"url\": \"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos\", \"source\": \"ykramarz@cisco.com\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Vendor Advisory\"]}]",
      "sourceIdentifier": "ykramarz@cisco.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"ykramarz@cisco.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-371\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-371\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2019-1977\",\"sourceIdentifier\":\"psirt@cisco.com\",\"published\":\"2019-08-30T09:15:20.553\",\"lastModified\":\"2024-11-21T04:37:48.753\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad dentro de la funcionalidad Endpoint Learning de Cisco Nexus 9000 Series Switches ejecut\u00e1ndose en el modo Application Centric Infrastructure (ACI), podr\u00eda permitir a un atacante remoto no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en dispositivo endpoint en determinadas circunstancias. La vulnerabilidad es debido al aprendizaje inapropiado del endpoint cuando los paquetes son recibidos en un puerto espec\u00edfico desde fuera de la estructura ACI y se destinan hacia un endpoint ubicado en el borde de una bifurcaci\u00f3n cuando se ha habilitado Disable Remote Endpoint Learning. Esto puede resultar en que se cree una entrada Remote (XR) para el endpoint afectado que se volver\u00e1 obsoleta si el endpoint migra a un puerto o switch de bifurcaci\u00f3n. Esto resulta en un tr\u00e1fico que no alcanza el endpoint afectado hasta que la entrada remota pueda ser reaprendida por otro mecanismo.\"}],\"metrics\":{\"cvssMetricV30\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.0\",\"vectorString\":\"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H\",\"baseScore\":6.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":4.0},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.0\",\"vectorString\":\"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:N/I:N/A:P\",\"baseScore\":4.3,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-371\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-371\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:nx-os:12.3\\\\(1h\\\\):*:*:*:*:*:*:*\",\"matchCriteriaId\":\"51A48073-7EB7-4954-8343-5C498681F25F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:nx-os:13.1\\\\(2m\\\\):*:*:*:*:*:*:*\",\"matchCriteriaId\":\"970718D9-4789-414B-8ED2-FBF914B4047C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:nx-os:13.1\\\\(2o\\\\):*:*:*:*:*:*:*\",\"matchCriteriaId\":\"7C45D91E-5AA4-46B4-9A87-75480AC04732\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:nx-os:13.1\\\\(2p\\\\):*:*:*:*:*:*:*\",\"matchCriteriaId\":\"973B7EE9-6B18-4D1D-8DEE-3C43D0CEB89C\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9000:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"8EBEBA5B-5589-417B-BF3B-976083E9FE54\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_93108tc-ex:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A90184B3-C82F-4CE5-B2AD-97D5E4690871\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_93108tc-fx:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AB89849-6DA4-4C9D-BC3F-EE0E41FD1901\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_93120tx:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07DE6F63-2C7D-415B-8C34-01EC05C062F3\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_93128tx:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F423E45D-A6DD-4305-9C6A-EAB26293E53A\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_93180lc-ex:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E952A96A-0F48-4357-B7DD-1127D8827650\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_93180yc-ex:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F70D81F1-8B12-4474-9060-B4934D8A3873\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_93180yc-fx:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"7349D69B-D8FA-4462-AA28-69DD18A652D9\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9332pq:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"113772B6-E9D2-4094-9468-3F4E1A87D07D\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9336c-fx2:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F1FC2B1F-232E-4754-8076-CC82F3648730\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9336pq:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"5F1127D2-12C0-454F-91EF-5EE334070D06\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9348gc-fxp:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"17C7E3DB-8E1A-47AD-B1C5-61747DC0CFB9\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9364c:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"63842B25-8C32-4988-BBBD-61E9CB09B4F3\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9372px:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"4364ADB9-8162-451D-806A-B98924E6B2CF\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9372px-e:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"B53BCB42-ED61-4FCF-8068-CB467631C63C\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9372tx:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"49E0371B-FDE2-473C-AA59-47E1269D050F\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9372tx-e:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"489D11EC-5A18-4F32-BC7C-AC1FCEC27222\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9396px:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"1BC5293E-F2B4-46DC-85DA-167EA323FCFD\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9396tx:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"EA022E77-6557-4A33-9A3A-D028E2DB669A\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9504:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"768BE390-5ED5-48A7-9E80-C4DE8BA979B1\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9508:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DDC2F709-AFBE-48EA-A3A2-DA1134534FB6\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:nexus_9516:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"7E02DC82-0D26-436F-BA64-73C958932B0A\"}]}]}],\"references\":[{\"url\":\"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos\",\"source\":\"psirt@cisco.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos\", \"name\": \"20190828 Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability\", \"tags\": [\"vendor-advisory\", \"x_refsource_CISCO\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T18:35:51.847Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2019-1977\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-11-21T18:57:07.380958Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-11-21T18:58:30.933Z\"}}], \"cna\": {\"title\": \"Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability\", \"source\": {\"defect\": [[\"CSCvi11291\"]], \"advisory\": \"cisco-sa-20190828-nexus-aci-dos\", \"discovery\": \"INTERNAL\"}, \"metrics\": [{\"cvssV3_0\": {\"scope\": \"CHANGED\", \"version\": \"3.0\", \"baseScore\": 6.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco Nexus 9000 Series Fabric Switches in ACI\", \"versions\": [{\"status\": \"affected\", \"version\": \"unspecified\", \"lessThan\": \"12.2(4M)\", \"versionType\": \"custom\"}]}], \"exploits\": [{\"lang\": \"en\", \"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.\"}], \"datePublic\": \"2019-08-28T00:00:00\", \"references\": [{\"url\": \"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos\", \"name\": \"20190828 Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability\", \"tags\": [\"vendor-advisory\", \"x_refsource_CISCO\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-371\", \"description\": \"CWE-371\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2019-08-29T21:50:14\"}, \"x_legacyV4Record\": {\"impact\": {\"cvss\": {\"version\": \"3.0\", \"baseScore\": \"6.8\", \"vectorString\": \"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H\"}}, \"source\": {\"defect\": [[\"CSCvi11291\"]], \"advisory\": \"cisco-sa-20190828-nexus-aci-dos\", \"discovery\": \"INTERNAL\"}, \"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"version\": {\"version_data\": [{\"affected\": \"\u003c\", \"version_value\": \"12.2(4M)\", \"version_affected\": \"\u003c\"}]}, \"product_name\": \"Cisco Nexus 9000 Series Fabric Switches in ACI\"}]}, \"vendor_name\": \"Cisco\"}]}}, \"exploit\": [{\"lang\": \"en\", \"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.\"}], \"data_type\": \"CVE\", \"references\": {\"reference_data\": [{\"url\": \"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dos\", \"name\": \"20190828 Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability\", \"refsource\": \"CISCO\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"CWE-371\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2019-1977\", \"STATE\": \"PUBLIC\", \"TITLE\": \"Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability\", \"ASSIGNER\": \"psirt@cisco.com\", \"DATE_PUBLIC\": \"2019-08-28T16:00:00-0700\"}}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2019-1977\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-21T19:15:02.726Z\", \"dateReserved\": \"2018-12-06T00:00:00\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2019-08-29T21:50:14.241461Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.