{"cve":{"cve_id":"CVE-2021-25220","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":0.0325,"epss_percentile":0.8671,"epss_as_of":"2026-06-23","description":"BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.","published_at":"2022-03-23T12:50:10.367000Z","last_modified_at":null,"cvss_v3_score":6.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N","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":null,"nvd_references":["https://kb.isc.org/v1/docs/cve-2021-25220","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/","https://security.netapp.com/advisory/ntap-20220408-0001/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/","https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf","https://security.gentoo.org/glsa/202210-25","https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220?language=en_US"],"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":"MEDIUM","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":"H","value_label":"High"},{"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":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind","product_name":"BIND","version_start":"Open Source Branch 9.11  9.11.0 through versions before 9.11.37","version_start_inclusive":true,"version_end":"Open Source Branch 9.11  9.11.0 through versions before 9.11.37","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind:Open Source Branch 9.11  9.11.0 through versions before 9.11.37:Open Source Branch 9.11  9.11.0 through versions before 9.11.37"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind","product_name":"BIND","version_start":"Development Branch 9.17  BIND 9.17 all version","version_start_inclusive":true,"version_end":"Development Branch 9.17  BIND 9.17 all version","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind:Development Branch 9.17  BIND 9.17 all version:Development Branch 9.17  BIND 9.17 all version"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind","product_name":"BIND","version_start":"Open Source Branch 9.12-16  9.12.0 through versions before 9.16.27","version_start_inclusive":true,"version_end":"Open Source Branch 9.12-16  9.12.0 through versions before 9.16.27","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind:Open Source Branch 9.12-16  9.12.0 through versions before 9.16.27:Open Source Branch 9.12-16  9.12.0 through versions before 9.16.27"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind","product_name":"BIND","version_start":"Open Source Branch 9.18 9.18.0","version_start_inclusive":true,"version_end":"Open Source Branch 9.18 9.18.0","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind:Open Source Branch 9.18 9.18.0:Open Source Branch 9.18 9.18.0"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind","product_name":"BIND","version_start":"Supported Preview Branch 9.11-S 9.11.0-S through versions before 9.11.37-S","version_start_inclusive":true,"version_end":"Supported Preview Branch 9.11-S 9.11.0-S through versions before 9.11.37-S","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind:Supported Preview Branch 9.11-S 9.11.0-S through versions before 9.11.37-S:Supported Preview Branch 9.11-S 9.11.0-S through versions before 9.11.37-S"},{"vendor_slug":"isc","vendor_name":"ISC","product_slug":"bind","product_name":"BIND","version_start":"Supported Preview Branch 9.16-S  9.16.0-S through versions before 9.16.27-S","version_start_inclusive":true,"version_end":"Supported Preview Branch 9.16-S  9.16.0-S through versions before 9.16.27-S","version_end_inclusive":true,"cpe23_uri":"cve5:isc:bind:Supported Preview Branch 9.16-S  9.16.0-S through versions before 9.16.27-S:Supported Preview Branch 9.16-S  9.16.0-S through versions before 9.16.27-S"}],"exploit_refs":[],"news":[],"references":[{"url":"https://kb.isc.org/v1/docs/cve-2021-25220","source_type":"MISC","tags":[]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYD7US4HZRFUGAJ66ZTHFBYVP5N3OQBY/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/API7U5E7SX7BAAVFNW366FFJGD6NZZKV/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://security.netapp.com/advisory/ntap-20220408-0001/","source_type":"MISC","tags":[]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5VX3I2U3ICOIEI5Y7OYA6CHOLFMNH3YQ/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SXT7247QTKNBQ67MNRGZD23ADXU6E5U/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DE3UAVCPUMAKG27ZL5YXSP2C3RIOW3JZ/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf","source_type":"MISC","tags":[]},{"url":"https://security.gentoo.org/glsa/202210-25","source_type":"MISC","tags":[]},{"url":"https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-SRX-Series-Cache-poisoning-vulnerability-in-BIND-used-by-DNS-Proxy-CVE-2021-25220?language=en_US","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2022-03-23T12:50:10.367000Z","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"}]}