cve-2022-20795
Vulnerability from cvelistv5
Published
2022-04-21 18:50
Modified
2024-11-06 16:22
Severity ?
5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Summary
Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability
References
ykramarz@cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vpndtls-dos-TunzLEVVendor Advisory
Impacted products
CiscoCisco Adaptive Security Appliance (ASA) Software
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T02:24:49.655Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "20220420 Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability",
            "tags": [
              "vendor-advisory",
              "x_refsource_CISCO",
              "x_transferred"
            ],
            "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vpndtls-dos-TunzLEV"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-20795",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-11-06T16:01:40.319401Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-11-06T16:22:08.505Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Cisco Adaptive Security Appliance (ASA) Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "datePublic": "2022-04-20T00:00:00",
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the implementation of the Datagram TLS (DTLS) protocol in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause high CPU utilization, resulting in a denial of service (DoS) condition. This vulnerability is due to suboptimal processing that occurs when establishing a DTLS tunnel as part of an AnyConnect SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted DTLS traffic to an affected device. A successful exploit could allow the attacker to exhaust resources on the affected VPN headend device. This could cause existing DTLS tunnels to stop passing traffic and prevent new DTLS tunnels from establishing, resulting in a DoS condition. Note: When the attack traffic stops, the device recovers gracefully."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-04-21T18:50:50",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "20220420 Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability",
          "tags": [
            "vendor-advisory",
            "x_refsource_CISCO"
          ],
          "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vpndtls-dos-TunzLEV"
        }
      ],
      "source": {
        "advisory": "cisco-sa-vpndtls-dos-TunzLEV",
        "defect": [
          [
            "CSCvz09106"
          ]
        ],
        "discovery": "INTERNAL"
      },
      "title": "Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "psirt@cisco.com",
          "DATE_PUBLIC": "2022-04-20T16:00:00",
          "ID": "CVE-2022-20795",
          "STATE": "PUBLIC",
          "TITLE": "Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Cisco Adaptive Security Appliance (ASA) Software",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Cisco"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "A vulnerability in the implementation of the Datagram TLS (DTLS) protocol in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause high CPU utilization, resulting in a denial of service (DoS) condition. This vulnerability is due to suboptimal processing that occurs when establishing a DTLS tunnel as part of an AnyConnect SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted DTLS traffic to an affected device. A successful exploit could allow the attacker to exhaust resources on the affected VPN headend device. This could cause existing DTLS tunnels to stop passing traffic and prevent new DTLS tunnels from establishing, resulting in a DoS condition. Note: When the attack traffic stops, the device recovers gracefully."
            }
          ]
        },
        "exploit": [
          {
            "lang": "en",
            "value": "The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory."
          }
        ],
        "impact": {
          "cvss": {
            "baseScore": "5.8",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.0"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-345"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "20220420 Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense Software AnyConnect SSL VPN Denial of Service Vulnerability",
              "refsource": "CISCO",
              "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vpndtls-dos-TunzLEV"
            }
          ]
        },
        "source": {
          "advisory": "cisco-sa-vpndtls-dos-TunzLEV",
          "defect": [
            [
              "CSCvz09106"
            ]
          ],
          "discovery": "INTERNAL"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2022-20795",
    "datePublished": "2022-04-21T18:50:51.145597Z",
    "dateReserved": "2021-11-02T00:00:00",
    "dateUpdated": "2024-11-06T16:22:08.505Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-20795\",\"sourceIdentifier\":\"ykramarz@cisco.com\",\"published\":\"2022-04-21T19:15:08.740\",\"lastModified\":\"2023-11-07T03:42:58.327\",\"vulnStatus\":\"Modified\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability in the implementation of the Datagram TLS (DTLS) protocol in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause high CPU utilization, resulting in a denial of service (DoS) condition. This vulnerability is due to suboptimal processing that occurs when establishing a DTLS tunnel as part of an AnyConnect SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted DTLS traffic to an affected device. A successful exploit could allow the attacker to exhaust resources on the affected VPN headend device. This could cause existing DTLS tunnels to stop passing traffic and prevent new DTLS tunnels from establishing, resulting in a DoS condition. Note: When the attack traffic stops, the device recovers gracefully.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad en la implementaci\u00f3n del protocolo Datagram TLS (DTLS) en el software Cisco Adaptive Security Appliance (ASA) y el software Cisco Firepower Threat Defense (FTD) podr\u00eda permitir a un atacante remoto no autenticado causar un alto uso de la CPU, resultando en una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad es debido al procesamiento sub\u00f3ptimo que es producido cuando es establecido un t\u00fanel DTLS como parte de una conexi\u00f3n VPN SSL AnyConnect. Un atacante podr\u00eda aprovechar esta vulnerabilidad mediante el env\u00edo de un flujo constante de tr\u00e1fico DTLS dise\u00f1ado a un dispositivo afectado. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante agotar los recursos del dispositivo de encabezado VPN afectado. Esto podr\u00eda causar que los t\u00faneles DTLS existentes dejaran de pasar tr\u00e1fico e impedir que se establecieran nuevos t\u00faneles DTLS, resultando en una condici\u00f3n de DoS. Nota: Cuando el tr\u00e1fico de ataque es detenido, el dispositivo es recuperado con elegancia\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"source\":\"ykramarz@cisco.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\",\"baseScore\":5.8,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:N/I:N/A:P\",\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\",\"baseScore\":5.0},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-345\"}]},{\"source\":\"ykramarz@cisco.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-345\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"9.16.3\",\"matchCriteriaId\":\"05FF8791-FAEC-4E4C-8CF2-8AF41E461E82\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"9.17.0\",\"versionEndIncluding\":\"9.17.1.9\",\"matchCriteriaId\":\"86E0342A-7459-4A0E-B046-AB2F1F04D5FA\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"8E6A8BB7-2000-4CA2-9DD7-89573CE4C73A\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"08F0F160-DAD2-48D4-B7B2-4818B2526F35\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"977D597B-F6DE-4438-AB02-06BE64D71EBE\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"EB71EB29-0115-4307-A9F7-262394FD9FB0\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"57179F60-E330-4FF0-9664-B1E4637FF210\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"5535C936-391B-4619-AA03-B35265FC15D7\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D1E828B8-5ECC-4A09-B2AD-DEDC558713DE\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"16AE20C2-C77E-4E04-BF13-A48696E52426\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:asa_for_nexus_1000v:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A198A68E-78A8-477F-B6D4-79AAB2C7BE22\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"7.0.1\",\"matchCriteriaId\":\"E8D80E3B-DD36-45E8-9F7F-38111B7FF5E2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"7.1.0.0\",\"versionEndIncluding\":\"7.1.0.1\",\"matchCriteriaId\":\"23670904-7E82-4434-A011-2462A56AB56E\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_1010:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"7FFE3880-4B85-4E23-9836-70875D5109F7\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_1120:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"727A02E8-40A1-4DFE-A3A2-91D628D3044F\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_1140:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"19F6546E-28F4-40DC-97D6-E0E023FE939B\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_1150:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"EB3B0EC3-4654-4D90-9D41-7EC2AD1DDF99\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_2110:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"52D96810-5F79-4A83-B8CA-D015790FCF72\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_2120:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"16FE2945-4975-4003-AE48-7E134E167A7F\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_2130:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DCE7122A-5AA7-4ECD-B024-E27C9D0CFB7B\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_2140:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"976901BF-C52C-4F81-956A-711AF8A60140\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_4110:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A0CBC7F5-7767-43B6-9384-BE143FCDBD7F\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_4112:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"957D64EB-D60E-4775-B9A8-B21CA48ED3B1\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_4115:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A694AD51-9008-4AE6-8240-98B17AB527EE\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_4120:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"38AE6DC0-2B03-4D36-9856-42530312CC46\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_4125:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"71DCEF22-ED20-4330-8502-EC2DD4C9838F\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_4140:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"3DB2822B-B752-4CD9-A178-934957E306B4\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_4145:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"81F4868A-6D62-479C-9C19-F9AABDBB6B24\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_4150:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"65378F3A-777C-4AE2-87FB-1E7402F9EA1B\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:cisco:firepower_9300:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07DAFDDA-718B-4B69-A524-B0CEB80FE960\"}]}]}],\"references\":[{\"url\":\"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vpndtls-dos-TunzLEV\",\"source\":\"ykramarz@cisco.com\",\"tags\":[\"Vendor Advisory\"]}]}}"
  }
}


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 seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.