{"cve":{"cve_id":"CVE-2021-41839","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":0.00275,"epss_percentile":0.19435,"epss_as_of":"2026-08-26","description":"An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.","published_at":"2022-02-03T01:37:10Z","last_modified_at":"2026-08-11T13:17:20.457000Z","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-119"],"nvd_references":["https://www.insyde.com/security-pledge","https://www.insyde.com/security-pledge/SA-2022020","https://security.netapp.com/advisory/ntap-20220217-0016/","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://www.insyde.com/security-pledge/SA-2022020","source_type":"MISC","tags":[]},{"url":"https://security.netapp.com/advisory/ntap-20220217-0016/","source_type":"MISC","tags":[]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2022-02-03T01:37:10Z","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"}]}