{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found by Santosh Krishnamurthy of Cisco during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the Internet Key Exchange Version 2 (IKEv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to trigger a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper control of a resource. An attacker with the ability to spoof a trusted IKEv2 site-to-site VPN peer and in possession of valid IKEv2 credentials for that peer could exploit this vulnerability by sending malformed, authenticated IKEv2 messages to an affected device. A successful exploit could allow the attacker to trigger a reload of the device.\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": "At the time of publication, this vulnerability affected Cisco products if they were running a vulnerable release of Cisco ASA Software or Cisco FTD Software and were configured with at least one IKEv2 site-to-site VPN peer.\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.\r\n  Determine the IKEv2 Site-to-Site VPN Configuration\r\nTo determine whether an IKEv2 site-to-site VPN peer is configured and enabled on the device, use the show running-config crypto CLI command and look for the presence of all of the following:\r\n\r\nIKEv2 enabled on an interface\r\nA crypto map specifying an IKEv2 proposal\r\nThe same crypto map in the same sequence number identifying a peer for the IPsec connection\r\nThe same crypto map enabled on an interface on which IKEv2 is enabled\r\n\r\nThe following example shows the output of the show running-config crypto command on a device that has IKEv2 enabled on the outside interface on which crypto map abcmap in sequence number 1 specifies IKEv2 proposal secure and IPsec peer 10.10.4.108 and on which crypto map abcmap is bound to the outside interface:\r\n\r\n\r\nfirewall# show running-config crypto\r\n.\r\n.\r\n.\r\ncrypto ikev2 enable outside\r\n.\r\n.\r\n.\r\ncrypto map abcmap 1 set peer 10.10.4.108\r\ncrypto map abcmap 1 set ikev2 ipsec-proposal secure\r\ncrypto map abcmap interface outside\r\n.\r\n.\r\n.\r\nfirewall#\r\n\r\nIn this example, the device is vulnerable to authenticated IKEv2 messages with an IPv4 source address of 10.10.4.108 destined to the outside interface.",
        "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 Center (FMC) Software.",
        "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      Fixed Releases\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\nCisco ASA Software\r\n\r\nCisco has released the following software updates to address this vulnerability. Customers who require software updates for platforms or releases that are not listed are advised to contact their support organization.\r\n        ASA Software Release  First Fixed Release for This Vulnerability          9.7 and earlier1  Not vulnerable.      9.8  9.8.4.40      9.91  Migrate to a fixed release.      9.101  Migrate to a fixed release.      9.12  9.12.4.30      9.131  Migrate to a fixed release.      9.14  9.14.3.9      9.15  9.15.1.17      9.16  9.16.2\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\nCisco FTD Software\r\n        FTD Software Release  First Fixed Release for This Vulnerability          6.2.2 and earlier1  Migrate to a fixed release.      6.2.3  Migrate to a fixed release.      6.3.01  Migrate to a fixed release.      6.4.0  6.4.0.13 (Nov 2021)      6.5.01  Migrate to a fixed release.      6.6.0  6.6.5      6.7.0  6.7.0.3 (Jan 2022)      7.0.0  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\n\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 Santosh Krishnamurthy 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 IKEv2 Site-to-Site VPN Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2-dos-g4cmrr7C"
      },
      {
        "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": "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": "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 IKEv2 Site-to-Site VPN Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2021-10-29T13:51:25+00:00",
      "generator": {
        "date": "2024-05-10T23:11:01+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-asaftd-ikev2-dos-g4cmrr7C",
      "initial_release_date": "2021-10-27T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2021-10-27T15:39:30+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        },
        {
          "date": "2021-10-29T13:51:25+00:00",
          "number": "1.1.0",
          "summary": "Updated the source section."
        }
      ],
      "status": "final",
      "version": "1.1.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.8.3.26",
                    "product": {
                      "name": "9.8.3.26",
                      "product_id": "CSAFPID-265020"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.8"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.12.4.4",
                    "product": {
                      "name": "9.12.4.4",
                      "product_id": "CSAFPID-280018"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.12"
              }
            ],
            "category": "product_family",
            "name": "Cisco Adaptive Security Appliance (ASA) Software"
          },
          {
            "branches": [
              {
                "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 4100 Series",
            "product": {
              "name": "Cisco Firepower 4100 Series",
              "product_id": "CSAFPID-277441"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Adaptive Security Virtual Appliance (ASAv)",
            "product": {
              "name": "Cisco Adaptive Security Virtual Appliance (ASAv)",
              "product_id": "CSAFPID-277511"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.8.3.26 when installed on Cisco Adaptive Security Virtual Appliance (ASAv)",
          "product_id": "CSAFPID-265020:277511"
        },
        "product_reference": "CSAFPID-265020",
        "relates_to_product_reference": "CSAFPID-277511"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.12.4.4 when installed on Cisco Firepower 4100 Series",
          "product_id": "CSAFPID-280018:277441"
        },
        "product_reference": "CSAFPID-280018",
        "relates_to_product_reference": "CSAFPID-277441"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Firepower Threat Defense Software 6.4.0.1 when installed on Cisco Firepower 4100 Series",
          "product_id": "CSAFPID-265015:277441"
        },
        "product_reference": "CSAFPID-265015",
        "relates_to_product_reference": "CSAFPID-277441"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-40125",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvy93480"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-265020:277511",
          "CSAFPID-280018:277441",
          "CSAFPID-265015:277441"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-265015:277441",
            "CSAFPID-265020:277511",
            "CSAFPID-280018:277441"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-265020:277511",
            "CSAFPID-280018:277441",
            "CSAFPID-265015:277441"
          ]
        }
      ],
      "title": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software IKEv2 Site-to-Site VPN Denial of Service Vulnerabilities"
    }
  ]
}