{"cve":{"cve_id":"CVE-2021-25218","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":0.03559,"epss_percentile":0.87828,"epss_as_of":"2026-06-23","description":"In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulnerable version of named receives a query under the circumstances described above, the named process will terminate due to a failed assertion check. The vulnerability affects only BIND 9 releases 9.16.19, 9.17.16, and release 9.16.19-S1 of the BIND Supported Preview Edition.","published_at":"2021-08-18T18:20:11.962000Z","last_modified_at":null,"cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://kb.isc.org/v1/docs/cve-2021-25218","http://www.openwall.com/lists/oss-security/2021/08/18/3","http://www.openwall.com/lists/oss-security/2021/08/20/2","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPJCLGSR4BTGFLBLGIE5TEQP2SNJKGVL/","https://security.netapp.com/advisory/ntap-20210909-0002/"],"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":"2026-06-28T23:15:14.317449Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","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":"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":"isc","vendor_name":"ISC","product_slug":"bind9","product_name":"BIND9","version_start":"Stable Branch 9.16.19","version_start_inclusive":true,"version_end":"Stable Branch 9.16.19","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind9:Stable Branch 9.16.19:Stable Branch 9.16.19"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind9","product_name":"BIND9","version_start":"Development Branch 9.17.16","version_start_inclusive":true,"version_end":"Development Branch 9.17.16","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind9:Development Branch 9.17.16:Development Branch 9.17.16"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind9","product_name":"BIND9","version_start":"Supported Preview Edition 9.16.19-S1","version_start_inclusive":true,"version_end":"Supported Preview Edition 9.16.19-S1","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind9:Supported Preview Edition 9.16.19-S1:Supported Preview Edition 9.16.19-S1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://kb.isc.org/v1/docs/cve-2021-25218","source_type":"MISC","tags":[]},{"url":"http://www.openwall.com/lists/oss-security/2021/08/18/3","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://www.openwall.com/lists/oss-security/2021/08/20/2","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPJCLGSR4BTGFLBLGIE5TEQP2SNJKGVL/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://security.netapp.com/advisory/ntap-20210909-0002/","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2021-08-18T18:20:11.962000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:05:36.865152Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:05:36.865152Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:05:36.865152Z","label":"CVSS score revised","source":"cvelistv5"}]}