{"cve":{"cve_id":"CVE-2021-45969","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":0.00279,"epss_percentile":0.1994,"epss_as_of":"2026-08-26","description":"An issue was discovered in AhciBusDxe in Insyde InsydeH2O with kernel 5.1 before 05.16.25, 5.2 before 05.26.25, 5.3 before 05.35.25, 5.4 before 05.43.25, and 5.5 before 05.51.25. A vulnerability exists in the SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer (the CommBuffer+8 location).","published_at":"2022-01-05T23:00:28Z","last_modified_at":"2026-08-11T13:17:22.643000Z","cvss_v3_score":8.2,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/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":["CWE-787"],"nvd_references":["https://www.insyde.com/security-pledge","https://security.netapp.com/advisory/ntap-20220216-0004/","https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf"],"vuln_status":"Modified","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":"2026-08-14T14:46:47.968730Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"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":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"insyde","vendor_name":"insyde","product_slug":"insydeh2o","product_name":"insydeh2o","version_start":"5.1","version_start_inclusive":true,"version_end":"5.16.25","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.insyde.com/security-pledge","source_type":"MISC","tags":[]},{"url":"https://security.netapp.com/advisory/ntap-20220216-0004/","source_type":"MISC","tags":[]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2022-01-05T23:00:28Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-08-13T20:20:23.063882Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-08-13T20:20:23.063882Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-08-13T20:20:23.063882Z","label":"CVSS score revised","source":"nvd"}]}