{"cve":{"cve_id":"CVE-2018-0231","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.04541,"epss_percentile":0.90853,"epss_as_of":"2026-08-26","description":"A vulnerability in the Transport Layer Security (TLS) library of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of the affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a malicious TLS message to an interface enabled for Secure Layer Socket (SSL) services on an affected device. Messages using SSL Version 3 (SSLv3) or SSL Version 2 (SSLv2) cannot be be used to exploit this vulnerability. An exploit could allow the attacker to cause a buffer underflow, triggering a crash on an affected device. This vulnerability affects Cisco ASA Software and Cisco FTD Software that is running on the following Cisco products: Adaptive Security Virtual Appliance (ASAv), Firepower Threat Defense Virtual (FTDv), Firepower 2100 Series Security Appliance. Cisco Bug IDs: CSCve18902, CSCve34335, CSCve38446.","published_at":"2018-04-19T20:00:00Z","last_modified_at":"2026-08-11T19:37:30.880000Z","cvss_v3_score":8.6,"cvss_v3_vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-20"],"nvd_references":["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3","http://www.securitytracker.com/id/1040725","https://ics-cert.us-cert.gov/advisories/ICSA-18-184-01"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-08-13T20:20:23.063882Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"adaptive-security-appliance-software","product_name":"adaptive_security_appliance_software","version_start":"9.8(1)","version_start_inclusive":true,"version_end":"9.8(1)","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8\\(1\\):*:*:*:*:*:*:*"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"adaptive-security-appliance-software","product_name":"adaptive_security_appliance_software","version_start":"98.1(1.154)","version_start_inclusive":true,"version_end":"98.1(1.154)","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:cisco:adaptive_security_appliance_software:98.1\\(1.154\\):*:*:*:*:*:*:*"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"secure-firewall-threat-defense","product_name":"secure_firewall_threat_defense","version_start":"6.0","version_start_inclusive":true,"version_end":"6.1.0.6","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"http://www.securitytracker.com/id/1040725","source_type":"MISC","tags":[]},{"url":"https://ics-cert.us-cert.gov/advisories/ICSA-18-184-01","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2018-04-19T20:00:00Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-06-24T00:31:10.389451Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:10.389451Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:10.389451Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-08-13T20:20:23.063882Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-08-13T20:20:23.063882Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-08-13T20:20:23.063882Z","label":"CVSS score revised","source":"nvd"}]}