{"cve":{"cve_id":"CVE-2020-5953","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":0.00284,"epss_percentile":0.20408,"epss_as_of":"2026-08-26","description":"A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code located in SWSMI handler that dereferences gRT (EFI_RUNTIME_SERVICES) pointer to call a GetVariable service, which is located outside of SMRAM. This can result in code execution in SMM (escalating privilege from ring 0 to ring -2).","published_at":"2022-02-03T01:00:57Z","last_modified_at":"2026-08-11T13:17:18.953000Z","cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:H/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":null,"nvd_references":["https://www.insyde.com/products","https://www.insyde.com/security-pledge","https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","https://security.netapp.com/advisory/ntap-20220222-0005/"],"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":"2026-08-13T20:20:23.063882Z"},"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":"H","value_label":"High"},{"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":"5.12.09.0074","version_start_inclusive":true,"version_end":"5.12.09.0074","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:insyde:insydeh2o:5.12.09.0074:*:*:*:*:*:*:*"},{"vendor_slug":"insyde","vendor_name":"insyde","product_slug":"insydeh2o","product_name":"insydeh2o","version_start":"5.23.04.0045","version_start_inclusive":true,"version_end":"5.23.04.0045","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:insyde:insydeh2o:5.23.04.0045:*:*:*:*:*:*:*"},{"vendor_slug":"insyde","vendor_name":"insyde","product_slug":"insydeh2o","product_name":"insydeh2o","version_start":"5.23.45.0023","version_start_inclusive":true,"version_end":"5.23.45.0023","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:insyde:insydeh2o:5.23.45.0023:*:*:*:*:*:*:*"},{"vendor_slug":"insyde","vendor_name":"insyde","product_slug":"insydeh2o","product_name":"insydeh2o","version_start":"5.33.15.0034","version_start_inclusive":true,"version_end":"5.33.15.0034","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:insyde:insydeh2o:5.33.15.0034:*:*:*:*:*:*:*"},{"vendor_slug":"insyde","vendor_name":"insyde","product_slug":"insydeh2o","product_name":"insydeh2o","version_start":"5.34.03.0029","version_start_inclusive":true,"version_end":"5.34.03.0029","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:insyde:insydeh2o:5.34.03.0029:*:*:*:*:*:*:*"},{"vendor_slug":"insyde","vendor_name":"insyde","product_slug":"insydeh2o","product_name":"insydeh2o","version_start":"5.42.03.0010","version_start_inclusive":true,"version_end":"5.42.03.0010","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:insyde:insydeh2o:5.42.03.0010:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"ruggedcom-ape1808-firmware","product_name":"ruggedcom_ape1808_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:ruggedcom_ape1808_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-field-pg-m5-firmware","product_name":"simatic_field_pg_m5_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_field_pg_m5_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-field-pg-m6-firmware","product_name":"simatic_field_pg_m6_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_field_pg_m6_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc127e-firmware","product_name":"simatic_ipc127e_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc127e_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc227g-firmware","product_name":"simatic_ipc227g_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc227g_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc277g-firmware","product_name":"simatic_ipc277g_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc277g_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc327g-firmware","product_name":"simatic_ipc327g_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc327g_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc377g-firmware","product_name":"simatic_ipc377g_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc377g_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc427e-firmware","product_name":"simatic_ipc427e_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc427e_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc477e-firmware","product_name":"simatic_ipc477e_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc477e_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc477e-pro-firmware","product_name":"simatic_ipc477e_pro_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc477e_pro_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc627e-firmware","product_name":"simatic_ipc627e_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc627e_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc647e-firmware","product_name":"simatic_ipc647e_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc647e_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc677e-firmware","product_name":"simatic_ipc677e_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc677e_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-ipc847e-firmware","product_name":"simatic_ipc847e_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_ipc847e_firmware:-:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"simatic-itp1000-firmware","product_name":"simatic_itp1000_firmware","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:siemens:simatic_itp1000_firmware:-:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.insyde.com/products","source_type":"MISC","tags":[]},{"url":"https://www.insyde.com/security-pledge","source_type":"MISC","tags":[]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","source_type":"MISC","tags":[]},{"url":"https://security.netapp.com/advisory/ntap-20220222-0005/","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2022-02-03T01:00:57Z","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"}]}