{"cve":{"cve_id":"CVE-2018-16841","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":0.04586,"epss_percentile":0.90414,"epss_as_of":"2026-06-23","description":"Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.","published_at":"2018-11-28T14:00:00Z","last_modified_at":null,"cvss_v3_score":5.7,"cvss_v3_vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-416"],"nvd_references":["http://www.securityfocus.com/bid/106023","https://usn.ubuntu.com/3827-2/","https://usn.ubuntu.com/3827-1/","https://security.netapp.com/advisory/ntap-20181127-0001/","https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841","https://www.debian.org/security/2018/dsa-4345","https://www.samba.org/samba/security/CVE-2018-16841.html","https://security.gentoo.org/glsa/202003-52"],"vuln_status":null,"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":"2026-06-28T23:10:58.453014Z"},"effective_severity":"MEDIUM","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":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"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":"unknown","vendor_name":"Unknown","product_slug":"samba","product_name":"samba","version_start":"4.7.12","version_start_inclusive":true,"version_end":"4.7.12","version_end_inclusive":true,"cpe23_uri":"cve5:unknown:samba:4.7.12:4.7.12"},{"vendor_slug":"unknown","vendor_name":"Unknown","product_slug":"samba","product_name":"samba","version_start":"4.8.7","version_start_inclusive":true,"version_end":"4.8.7","version_end_inclusive":true,"cpe23_uri":"cve5:unknown:samba:4.8.7:4.8.7"},{"vendor_slug":"unknown","vendor_name":"Unknown","product_slug":"samba","product_name":"samba","version_start":"4.9.3","version_start_inclusive":true,"version_end":"4.9.3","version_end_inclusive":true,"cpe23_uri":"cve5:unknown:samba:4.9.3:4.9.3"}],"exploit_refs":[],"news":[],"references":[{"url":"http://www.securityfocus.com/bid/106023","source_type":"MISC","tags":[]},{"url":"https://usn.ubuntu.com/3827-2/","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://usn.ubuntu.com/3827-1/","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20181127-0001/","source_type":"MISC","tags":[]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841","source_type":"MISC","tags":[]},{"url":"https://www.debian.org/security/2018/dsa-4345","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://www.samba.org/samba/security/CVE-2018-16841.html","source_type":"MISC","tags":[]},{"url":"https://security.gentoo.org/glsa/202003-52","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2018-11-28T14:00:00Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T16:57:47.401043Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T16:57:47.401043Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T16:57:47.401043Z","label":"CVSS score revised","source":"cvelistv5"}]}