{
  "affected": [],
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    "CVE-2021-1592"
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  "database_specific": {
    "cwe_ids": [
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-08-25T20:15:00Z",
    "severity": "MODERATE"
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  "details": "A vulnerability in the way Cisco UCS Manager software handles SSH sessions could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management for established SSH sessions. An attacker could exploit this vulnerability by opening a significant number of SSH sessions on an affected device. A successful exploit could allow the attacker to cause a crash and restart of internal Cisco UCS Manager software processes and a temporary loss of access to the Cisco UCS Manager CLI and web UI. Note: The attacker must have valid user credentials to authenticate to the affected device.",
  "id": "GHSA-g536-3jmm-mp33",
  "modified": "2022-05-24T19:12:07Z",
  "published": "2022-05-24T19:12:07Z",
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    {
      "type": "WEB",
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy"
    }
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  "schema_version": "1.4.0",
  "severity": []
}

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    "id": "GSD-2021-1592"
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}

{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found by Art Kalmykov of Cisco during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the way Cisco UCS Manager software handles SSH sessions could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper resource management for established SSH sessions. An attacker could exploit this vulnerability by opening a significant number of SSH sessions on an affected device. A successful exploit could allow the attacker to cause a crash and restart of internal Cisco UCS Manager software processes and a temporary loss of access to the Cisco UCS Manager CLI and web UI.\r\n\r\nNote: The attacker must have valid user credentials to authenticate to the affected device.\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-ucs-ssh-dos-MgvmyrQy [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy\"]\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 UCS 6400 Series Fabric Interconnects devices if they were running a vulnerable release of Cisco UCS Manager software.\r\n\r\nFor information about which Cisco software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that this vulnerability does not affect the following Cisco products:\r\n\r\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\r\nUCS 6200 Series Fabric Interconnects\r\nUCS 6300 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 UCS Software\r\nAt the time of publication, the release information in the following table(s) was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n\r\nThe left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability described in this advisory and which release included the fix for this vulnerability.\r\n\r\nUCS 6400 Series Fabric Interconnects\r\n        Cisco UCS Software Release  First Fixed Release for This Vulnerability          4.0  4.0(4m)      4.1  4.1(3e)      4.2  Not vulnerable          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 by Art Kalmykov of Cisco 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": "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 UCS Manager Software SSH Sessions Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy"
      },
      {
        "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-ucs-ssh-dos-MgvmyrQy",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-ssh-dos-MgvmyrQy"
      },
      {
        "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"
      },
      {
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        "summary": "Cisco\u0026nbsp;Security Advisories page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "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 UCS Manager Software SSH Sessions Denial of Service 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-ucs-ssh-dos-MgvmyrQy",
      "initial_release_date": "2021-08-25T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2021-08-25T15:49:21+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
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      "status": "final",
      "version": "1.0.0"
    }
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  "product_tree": {
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            "name": "Cisco Unified Computing System (Managed)",
            "product": {
              "name": "Cisco Unified Computing System (Managed) ",
              "product_id": "CSAFPID-112776"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-1592",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvw33513"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-112776"
        ]
      },
      "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-112776"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-112776"
          ]
        }
      ],
      "title": "Cisco UCS Manager Software SSH Session Denial of Service Vulnerability"
    }
  ]
}