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    "id": "GSD-2021-40117"
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      "remediation": "unknown",
      "reportConfidence": "confirmed",
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      "id": "GSD-2021-40117",
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}

{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found by Sanmith Prakash of Cisco during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in SSL/TLS message handler for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability exists because incoming SSL/TLS packets are not properly processed. An attacker could exploit this vulnerability by sending a crafted SSL/TLS packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the October 2021 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74773\"].",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco products if they are running a vulnerable release of Cisco ASA Software or Cisco FTD Software and have a vulnerable AnyConnect or WebVPN configured.\r\n\r\nFor information about which Cisco software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.\r\n  Determine the ASA Software Configuration\r\nTo determine if a device is configured for AnyConnect IKEv2 Remote Access, AnyConnect SSL VPN, or Clientless SSL VPN, use the show running-config CLI command. In the following table, the left column lists the Cisco ASA features that are vulnerable. The right column indicates the vulnerable configuration for the feature from the show running-config CLI command. If the device is configured for one of these features, it is considered vulnerable.\r\n                                Cisco ASA Feature              Vulnerable Configuration                                              AnyConnect IKEv2 Remote Access (with client services)\r\ncrypto ikev2 enable \u003cinterface_name\u003e client-services port \u003cport #\u003e\r\n                                              AnyConnect SSL VPN\r\nwebvpn\r\nenable \u003cinterface_name\u003e\r\n                                              Clientless SSL VPN\r\nwebvpn\r\nenable \u003cinterface_name\u003e\r\n\r\n   Determine the FTD Software Configuration\r\nTo determine if a device is configured for AnyConnect IKEv2 Remote Access or AnyConnect SSL VPN, use the show running-config CLI command. In the following table, the left column lists the Cisco FTD features that are vulnerable. The right column indicates the basic configuration for the feature from the show running-config CLI command. If the device is configured for one of these features, it is considered vulnerable.\r\n\r\nOn devices running Cisco FTD Software, the show running-config command is available from Diagnostic CLI mode [\"https://www.cisco.com/c/en/us/td/docs/security/firepower/command_ref/b_Command_Reference_for_Firepower_Threat_Defense/using_the_FTD_CLI.html#wp3783114587\"] only. To enter Diagnostic CLI mode, use the system support diagnostic-cli command in the regular Cisco Firepower Threat Defense CLI.\r\n                                Cisco FTD Feature              Vulnerable Configuration                                              AnyConnect IKEv2 Remote Access (with client services)1,2\r\ncrypto ikev2 enable \u003cinterface_name\u003e client-services port \u003cport #\u003e\r\n                                              AnyConnect SSL VPN1,2\r\nwebvpn\r\nenable \u003cinterface_name\u003e\r\n\r\n1. Remote Access VPN features are enabled through Devices \u003e VPN \u003e Remote Access in the Cisco Firepower Management Center (FMC) or through Device \u003e Remote Access VPN in Cisco Firepower Device Manager (FDM).\r\n2. Remote Access VPN features were first supported in Cisco FTD Software Release 6.2.2.",
        "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 Cisco Firepower Management (FMC) Software.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has released free software updates that address the vulnerability described in this advisory. Customers 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\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 center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by any of the Critical or High SIR vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.\r\n\r\nASA Software\r\n                                Cisco ASA Software Release              First Fixed Release for This Vulnerability              First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories                                              9.7 and earlier1              Migrate to a fixed release.              Migrate to a fixed release.                                  9.8              9.8.4.40              9.8.4.40                                  9.91              Migrate to a fixed release.              Migrate to a fixed release.                                  9.101              Migrate to a fixed release.              Migrate to a fixed release.                                  9.12              9.12.4.26              9.12.4.29                                  9.131              Migrate to a fixed release.              Migrate to a fixed release.                                  9.14              9.14.3.9              9.14.3.9                                  9.15              9.15.1.17              9.15.1.17                                  9.16              Not vulnerable.              9.16.2.3\r\n1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9, 9.10, and 9.13 have reached end of software maintenance [\"https://www.cisco.com/c/en/us/products/eos-eol-listing.html\"]. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.\r\nFTD Software\r\n                                Cisco FTD Software Release              First Fixed Release for This Vulnerability              First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories                                              6.2.2 and earlier1              Migrate to a fixed release.              Migrate to a fixed release.                                  6.2.3              6.2.3.17              Migrate to a fixed release.                                  6.3.01              Migrate to a fixed release.              Migrate to a fixed release.                                  6.4.0              6.4.0.13 (Nov 2021)              6.4.0.13 (Nov 2021)                                  6.5.01              Migrate to a fixed release.              Migrate to a fixed release.                                  6.6.0              6.6.5              6.6.5.1 (Nov 2021)                                  6.7.0              6.7.0.3 (Jan 2022)              6.7.0.3 (Jan 2022)                                  7.0.0              Not vulnerable.              7.0.1\r\n1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as releases 6.3.0 and 6.5.0, have reached end of software maintenance [\"https://www.cisco.com/c/en/us/products/eos-eol-listing.html\"]. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.\r\nFor instructions on upgrading your FTD device, see Cisco Firepower Management Center Upgrade Guide [\"https://www.cisco.com/c/en/us/td/docs/security/firepower/upgrade/fpmc-upgrade-guide/getting_started.html\"].\r\n\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "text": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "This vulnerability was found by Sanmith Prakash 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": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-dos-4ygzLKU9"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74773"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Diagnostic CLI mode",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/firepower/command_ref/b_Command_Reference_for_Firepower_Threat_Defense/using_the_FTD_CLI.html#wp3783114587"
      },
      {
        "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": "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"
      },
      {
        "category": "external",
        "summary": "end of software maintenance",
        "url": "https://www.cisco.com/c/en/us/products/eos-eol-listing.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Firepower Management Center Upgrade Guide",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/firepower/upgrade/fpmc-upgrade-guide/getting_started.html"
      }
    ],
    "title": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2021-10-27T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T23:10:53+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-asaftd-dos-4ygzLKU9",
      "initial_release_date": "2021-10-27T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2021-10-27T15:39:26+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
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        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 6.6.4 when installed on Cisco Firepower 4100 Series",
          "product_id": "CSAFPID-282174:277441"
        },
        "product_reference": "CSAFPID-282174",
        "relates_to_product_reference": "CSAFPID-277441"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 6.6.4 when installed on Cisco Secure Firewall Threat Defense Virtual",
          "product_id": "CSAFPID-282174:277464"
        },
        "product_reference": "CSAFPID-282174",
        "relates_to_product_reference": "CSAFPID-277464"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 6.4.0.1 when installed on Cisco 3000 Series Industrial Security Appliances (ISA)",
          "product_id": "CSAFPID-265015:277438"
        },
        "product_reference": "CSAFPID-265015",
        "relates_to_product_reference": "CSAFPID-277438"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-40117",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvy43187"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-248821:277511",
          "CSAFPID-255557:277437",
          "CSAFPID-265029:277437",
          "CSAFPID-265029:277511",
          "CSAFPID-268481:277392",
          "CSAFPID-278719:277437",
          "CSAFPID-279462:277440",
          "CSAFPID-281568:277511",
          "CSAFPID-251757:277392",
          "CSAFPID-265015:277438",
          "CSAFPID-280013:277392",
          "CSAFPID-280013:277393",
          "CSAFPID-280013:277437",
          "CSAFPID-280013:277438",
          "CSAFPID-280013:277440",
          "CSAFPID-280013:277441",
          "CSAFPID-280013:277464",
          "CSAFPID-281981:277392",
          "CSAFPID-281981:277393",
          "CSAFPID-281981:277437",
          "CSAFPID-281981:277438",
          "CSAFPID-281981:277440",
          "CSAFPID-281981:277441",
          "CSAFPID-281981:277464",
          "CSAFPID-282174:277392",
          "CSAFPID-282174:277393",
          "CSAFPID-282174:277437",
          "CSAFPID-282174:277438",
          "CSAFPID-282174:277440",
          "CSAFPID-282174:277441",
          "CSAFPID-282174:277464"
        ]
      },
      "release_date": "2021-10-27T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-251757:277392",
            "CSAFPID-265015:277438",
            "CSAFPID-280013:277392",
            "CSAFPID-280013:277393",
            "CSAFPID-280013:277437",
            "CSAFPID-280013:277438",
            "CSAFPID-280013:277440",
            "CSAFPID-280013:277441",
            "CSAFPID-280013:277464",
            "CSAFPID-281981:277392",
            "CSAFPID-281981:277393",
            "CSAFPID-281981:277437",
            "CSAFPID-281981:277438",
            "CSAFPID-281981:277440",
            "CSAFPID-281981:277441",
            "CSAFPID-281981:277464",
            "CSAFPID-282174:277392",
            "CSAFPID-282174:277393",
            "CSAFPID-282174:277437",
            "CSAFPID-282174:277438",
            "CSAFPID-282174:277440",
            "CSAFPID-282174:277441",
            "CSAFPID-282174:277464",
            "CSAFPID-248821:277511",
            "CSAFPID-255557:277437",
            "CSAFPID-265029:277437",
            "CSAFPID-265029:277511",
            "CSAFPID-268481:277392",
            "CSAFPID-278719:277437",
            "CSAFPID-279462:277440",
            "CSAFPID-281568:277511"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-248821:277511",
            "CSAFPID-255557:277437",
            "CSAFPID-265029:277437",
            "CSAFPID-265029:277511",
            "CSAFPID-268481:277392",
            "CSAFPID-278719:277437",
            "CSAFPID-279462:277440",
            "CSAFPID-281568:277511",
            "CSAFPID-251757:277392",
            "CSAFPID-265015:277438",
            "CSAFPID-280013:277392",
            "CSAFPID-280013:277393",
            "CSAFPID-280013:277437",
            "CSAFPID-280013:277438",
            "CSAFPID-280013:277440",
            "CSAFPID-280013:277441",
            "CSAFPID-280013:277464",
            "CSAFPID-281981:277392",
            "CSAFPID-281981:277393",
            "CSAFPID-281981:277437",
            "CSAFPID-281981:277438",
            "CSAFPID-281981:277440",
            "CSAFPID-281981:277441",
            "CSAFPID-281981:277464",
            "CSAFPID-282174:277392",
            "CSAFPID-282174:277393",
            "CSAFPID-282174:277437",
            "CSAFPID-282174:277438",
            "CSAFPID-282174:277440",
            "CSAFPID-282174:277441",
            "CSAFPID-282174:277464"
          ]
        }
      ],
      "title": "Cisco Adaptive Security Appliance and Firepower Threat Defense Software Denial of Service Vulnerability"
    }
  ]
}

{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found by Sanmith Prakash of Cisco during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in SSL/TLS message handler for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability exists because incoming SSL/TLS packets are not properly processed. An attacker could exploit this vulnerability by sending a crafted SSL/TLS packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the October 2021 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74773\"].",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco products if they are running a vulnerable release of Cisco ASA Software or Cisco FTD Software and have a vulnerable AnyConnect or WebVPN configured.\r\n\r\nFor information about which Cisco software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.\r\n  Determine the ASA Software Configuration\r\nTo determine if a device is configured for AnyConnect IKEv2 Remote Access, AnyConnect SSL VPN, or Clientless SSL VPN, use the show running-config CLI command. In the following table, the left column lists the Cisco ASA features that are vulnerable. The right column indicates the vulnerable configuration for the feature from the show running-config CLI command. If the device is configured for one of these features, it is considered vulnerable.\r\n                                Cisco ASA Feature              Vulnerable Configuration                                              AnyConnect IKEv2 Remote Access (with client services)\r\ncrypto ikev2 enable \u003cinterface_name\u003e client-services port \u003cport #\u003e\r\n                                              AnyConnect SSL VPN\r\nwebvpn\r\nenable \u003cinterface_name\u003e\r\n                                              Clientless SSL VPN\r\nwebvpn\r\nenable \u003cinterface_name\u003e\r\n\r\n   Determine the FTD Software Configuration\r\nTo determine if a device is configured for AnyConnect IKEv2 Remote Access or AnyConnect SSL VPN, use the show running-config CLI command. In the following table, the left column lists the Cisco FTD features that are vulnerable. The right column indicates the basic configuration for the feature from the show running-config CLI command. If the device is configured for one of these features, it is considered vulnerable.\r\n\r\nOn devices running Cisco FTD Software, the show running-config command is available from Diagnostic CLI mode [\"https://www.cisco.com/c/en/us/td/docs/security/firepower/command_ref/b_Command_Reference_for_Firepower_Threat_Defense/using_the_FTD_CLI.html#wp3783114587\"] only. To enter Diagnostic CLI mode, use the system support diagnostic-cli command in the regular Cisco Firepower Threat Defense CLI.\r\n                                Cisco FTD Feature              Vulnerable Configuration                                              AnyConnect IKEv2 Remote Access (with client services)1,2\r\ncrypto ikev2 enable \u003cinterface_name\u003e client-services port \u003cport #\u003e\r\n                                              AnyConnect SSL VPN1,2\r\nwebvpn\r\nenable \u003cinterface_name\u003e\r\n\r\n1. Remote Access VPN features are enabled through Devices \u003e VPN \u003e Remote Access in the Cisco Firepower Management Center (FMC) or through Device \u003e Remote Access VPN in Cisco Firepower Device Manager (FDM).\r\n2. Remote Access VPN features were first supported in Cisco FTD Software Release 6.2.2.",
        "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 Cisco Firepower Management (FMC) Software.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has released free software updates that address the vulnerability described in this advisory. Customers 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\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 center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by any of the Critical or High SIR vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.\r\n\r\nASA Software\r\n                                Cisco ASA Software Release              First Fixed Release for This Vulnerability              First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories                                              9.7 and earlier1              Migrate to a fixed release.              Migrate to a fixed release.                                  9.8              9.8.4.40              9.8.4.40                                  9.91              Migrate to a fixed release.              Migrate to a fixed release.                                  9.101              Migrate to a fixed release.              Migrate to a fixed release.                                  9.12              9.12.4.26              9.12.4.29                                  9.131              Migrate to a fixed release.              Migrate to a fixed release.                                  9.14              9.14.3.9              9.14.3.9                                  9.15              9.15.1.17              9.15.1.17                                  9.16              Not vulnerable.              9.16.2.3\r\n1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9, 9.10, and 9.13 have reached end of software maintenance [\"https://www.cisco.com/c/en/us/products/eos-eol-listing.html\"]. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.\r\nFTD Software\r\n                                Cisco FTD Software Release              First Fixed Release for This Vulnerability              First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories                                              6.2.2 and earlier1              Migrate to a fixed release.              Migrate to a fixed release.                                  6.2.3              6.2.3.17              Migrate to a fixed release.                                  6.3.01              Migrate to a fixed release.              Migrate to a fixed release.                                  6.4.0              6.4.0.13 (Nov 2021)              6.4.0.13 (Nov 2021)                                  6.5.01              Migrate to a fixed release.              Migrate to a fixed release.                                  6.6.0              6.6.5              6.6.5.1 (Nov 2021)                                  6.7.0              6.7.0.3 (Jan 2022)              6.7.0.3 (Jan 2022)                                  7.0.0              Not vulnerable.              7.0.1\r\n1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as releases 6.3.0 and 6.5.0, have reached end of software maintenance [\"https://www.cisco.com/c/en/us/products/eos-eol-listing.html\"]. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.\r\nFor instructions on upgrading your FTD device, see Cisco Firepower Management Center Upgrade Guide [\"https://www.cisco.com/c/en/us/td/docs/security/firepower/upgrade/fpmc-upgrade-guide/getting_started.html\"].\r\n\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "text": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "This vulnerability was found by Sanmith Prakash 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": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-dos-4ygzLKU9"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74773"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Diagnostic CLI mode",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/firepower/command_ref/b_Command_Reference_for_Firepower_Threat_Defense/using_the_FTD_CLI.html#wp3783114587"
      },
      {
        "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": "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"
      },
      {
        "category": "external",
        "summary": "end of software maintenance",
        "url": "https://www.cisco.com/c/en/us/products/eos-eol-listing.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Firepower Management Center Upgrade Guide",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/firepower/upgrade/fpmc-upgrade-guide/getting_started.html"
      }
    ],
    "title": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2021-10-27T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T23:10:53+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-asaftd-dos-4ygzLKU9",
      "initial_release_date": "2021-10-27T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2021-10-27T15:39:26+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.8.2.28",
                    "product": {
                      "name": "9.8.2.28",
                      "product_id": "CSAFPID-248821"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.8.3.21",
                    "product": {
                      "name": "9.8.3.21",
                      "product_id": "CSAFPID-255557"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.8.4.26",
                    "product": {
                      "name": "9.8.4.26",
                      "product_id": "CSAFPID-279462"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.8"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.12.1.3",
                    "product": {
                      "name": "9.12.1.3",
                      "product_id": "CSAFPID-265029"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.12.2",
                    "product": {
                      "name": "9.12.2",
                      "product_id": "CSAFPID-268481"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.12.2.1",
                    "product": {
                      "name": "9.12.2.1",
                      "product_id": "CSAFPID-278719"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.12.4.13",
                    "product": {
                      "name": "9.12.4.13",
                      "product_id": "CSAFPID-281568"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.12"
              }
            ],
            "category": "product_family",
            "name": "Cisco Adaptive Security Appliance (ASA) Software"
          },
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "6.2.3.8",
                    "product": {
                      "name": "6.2.3.8",
                      "product_id": "CSAFPID-251757"
                    }
                  }
                ],
                "category": "product_version",
                "name": "6.2"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "6.6.1",
                    "product": {
                      "name": "6.6.1",
                      "product_id": "CSAFPID-280013"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.6.3",
                    "product": {
                      "name": "6.6.3",
                      "product_id": "CSAFPID-281981"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.6.4",
                    "product": {
                      "name": "6.6.4",
                      "product_id": "CSAFPID-282174"
                    }
                  }
                ],
                "category": "product_version",
                "name": "6.6"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "6.4.0.1",
                    "product": {
                      "name": "6.4.0.1",
                      "product_id": "CSAFPID-265015"
                    }
                  }
                ],
                "category": "product_version",
                "name": "6.4"
              }
            ],
            "category": "product_family",
            "name": "Cisco Firepower Threat Defense Software"
          },
          {
            "category": "product_name",
            "name": "Cisco Firepower 2100 Series",
            "product": {
              "name": "Cisco Firepower 2100 Series",
              "product_id": "CSAFPID-277392"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco ASA 5500-X Series Firewalls",
            "product": {
              "name": "Cisco ASA 5500-X Series Firewalls",
              "product_id": "CSAFPID-277437"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Firepower 9000 Series",
            "product": {
              "name": "Cisco Firepower 9000 Series",
              "product_id": "CSAFPID-277440"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Adaptive Security Virtual Appliance (ASAv)",
            "product": {
              "name": "Cisco Adaptive Security Virtual Appliance (ASAv)",
              "product_id": "CSAFPID-277511"
            }
          },
          {
            "category": "product_name",
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          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
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      "release_date": "2021-10-27T16:00:00+00:00",
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}

{
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    "github_reviewed_at": null,
    "nvd_published_at": "2021-10-27T19:15:00Z",
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  "id": "GHSA-x7cf-699f-fpwc",
  "modified": "2023-08-16T18:30:20Z",
  "published": "2022-05-24T19:18:53Z",
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      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-40117"
    },
    {
      "type": "WEB",
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-dos-4ygzLKU9"
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