{"cve":{"cve_id":"CVE-2023-31421","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":0.0027,"epss_percentile":0.18423,"epss_as_of":"2026-06-23","description":"It was discovered that when acting as TLS clients, Beats, Elastic Agent, APM Server, and Fleet Server did not verify whether the server certificate is valid for the target IP address; however, certificate signature validation is still performed. More specifically, when the client is configured to connect to an IP address (instead of a hostname) it does not validate the server certificate's IP SAN values against that IP address and certificate validation fails, and therefore the connection is not blocked as expected.","published_at":"2023-10-26T03:10:52.684000Z","last_modified_at":null,"cvss_v3_score":5.9,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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":["CWE-295"],"nvd_references":["https://discuss.elastic.co/t/beats-elastic-agent-apm-server-and-fleet-server-8-10-1-security-update-improper-certificate-validation-issue-esa-2023-16/343385","https://www.elastic.co/community/security"],"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":"2026-06-28T23:19:58.070006Z"},"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":"H","value_label":"High"},{"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":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"elastic","vendor_name":"Elastic","product_slug":"apm-server","product_name":"APM Server","version_start":"8.0.0, 8.9.2","version_start_inclusive":true,"version_end":"8.0.0, 8.9.2","version_end_inclusive":true,"cpe23_uri":"cve5:elastic:apm-server:8.0.0, 8.9.2:8.0.0, 8.9.2"},{"vendor_slug":"elastic","vendor_name":"Elastic","product_slug":"beats","product_name":"Beats","version_start":"8.0.0, 8.9.2","version_start_inclusive":true,"version_end":"8.0.0, 8.9.2","version_end_inclusive":true,"cpe23_uri":"cve5:elastic:beats:8.0.0, 8.9.2:8.0.0, 8.9.2"},{"vendor_slug":"elastic","vendor_name":"Elastic","product_slug":"elastic-agent","product_name":"Elastic Agent","version_start":"8.0.0, 8.9.2","version_start_inclusive":true,"version_end":"8.0.0, 8.9.2","version_end_inclusive":true,"cpe23_uri":"cve5:elastic:elastic-agent:8.0.0, 8.9.2:8.0.0, 8.9.2"},{"vendor_slug":"elastic","vendor_name":"Elastic","product_slug":"fleet-server","product_name":"Fleet Server","version_start":"8.0.0, 8.9.2","version_start_inclusive":true,"version_end":"8.0.0, 8.9.2","version_end_inclusive":true,"cpe23_uri":"cve5:elastic:fleet-server:8.0.0, 8.9.2:8.0.0, 8.9.2"}],"exploit_refs":[],"news":[],"references":[{"url":"https://discuss.elastic.co/t/beats-elastic-agent-apm-server-and-fleet-server-8-10-1-security-update-improper-certificate-validation-issue-esa-2023-16/343385","source_type":"MISC","tags":[]},{"url":"https://www.elastic.co/community/security","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2023-10-26T03:10:52.684000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:28:10.983340Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:28:10.983340Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:28:10.983340Z","label":"CVSS score revised","source":"cvelistv5"}]}