{"cve":"CVE-2020-5953","nvd":{"published":"2022-02-03T01:15:07.647","modified":"2026-08-11T13:17:18.953","status":"Modified","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).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H","score":7.5},"cwes":[],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","https://security.netapp.com/advisory/ntap-20220222-0005/","https://www.insyde.com/products","https://www.insyde.com/security-pledge","https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf"],"products":["insyde:insydeh2o","siemens:ruggedcom_ape1808_firmware","siemens:simatic_field_pg_m5_firmware","siemens:simatic_field_pg_m6_firmware","siemens:simatic_ipc127e_firmware","siemens:simatic_ipc227g_firmware","siemens:simatic_ipc277g_firmware","siemens:simatic_ipc327g_firmware","siemens:simatic_ipc377g_firmware","siemens:simatic_ipc427e_firmware","siemens:simatic_ipc477e_firmware","siemens:simatic_ipc477e_pro_firmware","siemens:simatic_ipc627e_firmware","siemens:simatic_ipc647e_firmware","siemens:simatic_ipc677e_firmware","siemens:simatic_ipc847e_firmware","siemens:simatic_itp1000_firmware"],"source":"nvd","synced_at":"2026-10-19T21:27:20.926095847+00:00"},"epss":{"cve":"CVE-2020-5953","score":0.00284,"percentile":0.20939,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}