{"cve":{"cve_id":"CVE-2021-25215","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":0.11296,"epss_percentile":0.95407,"epss_as_of":"2026-06-23","description":"In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a query for a record triggering the flaw described above, the named process will terminate due to a failed assertion check. The vulnerability affects all currently maintained BIND 9 branches (9.11, 9.11-S, 9.16, 9.16-S, 9.17) as well as all other versions of BIND 9.","published_at":"2021-04-29T00:55:16.726000Z","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-2021-25215","http://www.openwall.com/lists/oss-security/2021/04/29/1","http://www.openwall.com/lists/oss-security/2021/04/29/2","http://www.openwall.com/lists/oss-security/2021/04/29/3","http://www.openwall.com/lists/oss-security/2021/04/29/4","https://www.debian.org/security/2021/dsa-4909","https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEC2XG4Q2ODTN2C4CGXEIXU3EUTBMK7L/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDSRPCJQ7MZC6CENH5PO3VQOFI7VSWBE/","https://www.oracle.com/security-alerts/cpuoct2021.html","https://security.netapp.com/advisory/ntap-20210521-0006/","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"],"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 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through 9.11 9.0.0 through versions before 9.11.30:Open Source Branches 9.0 through 9.11 9.0.0 through versions before 9.11.30"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind9","product_name":"BIND9","version_start":"Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14","version_start_inclusive":true,"version_end":"Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind9:Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14:Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind9","product_name":"BIND9","version_start":"Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1","version_start_inclusive":true,"version_end":"Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind9:Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1:Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind9","product_name":"BIND9","version_start":"Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1","version_start_inclusive":true,"version_end":"Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind9:Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1:Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind9","product_name":"BIND9","version_start":"Development Branch 9.17 9.17.0 through versiosn before 9.17.12","version_start_inclusive":true,"version_end":"Development Branch 9.17 9.17.0 through versiosn before 9.17.12","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind9:Development Branch 9.17 9.17.0 through versiosn before 9.17.12:Development Branch 9.17 9.17.0 through versiosn before 9.17.12"}],"exploit_refs":[],"news":[],"references":[{"url":"https://kb.isc.org/v1/docs/cve-2021-25215","source_type":"MISC","tags":[]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/29/1","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/29/2","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/29/3","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/29/4","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://www.debian.org/security/2021/dsa-4909","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEC2XG4Q2ODTN2C4CGXEIXU3EUTBMK7L/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDSRPCJQ7MZC6CENH5PO3VQOFI7VSWBE/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20210521-0006/","source_type":"MISC","tags":[]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2021-04-29T00:55:16.726000Z","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"}]}