{"id":"CVE-2020-5953","aliases":["EUVD-2020-27107","GHSA-f8pw-77pg-8gv6"],"status":"published","title":"A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware...","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).","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00284,"percentile":0.2104,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2022-02-03T01:00:57Z","modified":"2026-08-11T15:30:32Z","products":[{"vendor":"insyde","product":"insydeh2o"},{"vendor":"siemens","product":"ruggedcom_ape1808_firmware"},{"vendor":"siemens","product":"simatic field pg m5"},{"vendor":"siemens","product":"simatic field pg m6"},{"vendor":"siemens","product":"simatic ipc127e"},{"vendor":"siemens","product":"simatic ipc227g"},{"vendor":"siemens","product":"simatic ipc277g"},{"vendor":"siemens","product":"simatic ipc327g"},{"vendor":"siemens","product":"simatic ipc377g"},{"vendor":"siemens","product":"simatic ipc427e"},{"vendor":"siemens","product":"simatic ipc477e"},{"vendor":"siemens","product":"simatic ipc477e pro"},{"vendor":"siemens","product":"simatic ipc627e"},{"vendor":"siemens","product":"simatic ipc647e"},{"vendor":"siemens","product":"simatic ipc677e"},{"vendor":"siemens","product":"simatic ipc847e"},{"vendor":"siemens","product":"simatic itp1000"},{"vendor":"siemens","product":"simatic_field_pg_m5_firmware"},{"vendor":"siemens","product":"simatic_field_pg_m6_firmware"},{"vendor":"siemens","product":"simatic_ipc127e_firmware"},{"vendor":"siemens","product":"simatic_ipc227g_firmware"},{"vendor":"siemens","product":"simatic_ipc277g_firmware"},{"vendor":"siemens","product":"simatic_ipc327g_firmware"},{"vendor":"siemens","product":"simatic_ipc377g_firmware"},{"vendor":"siemens","product":"simatic_ipc427e_firmware"},{"vendor":"siemens","product":"simatic_ipc477e_firmware"},{"vendor":"siemens","product":"simatic_ipc477e_pro_firmware"},{"vendor":"siemens","product":"simatic_ipc627e_firmware"},{"vendor":"siemens","product":"simatic_ipc647e_firmware"},{"vendor":"siemens","product":"simatic_ipc677e_firmware"},{"vendor":"siemens","product":"simatic_ipc847e_firmware"},{"vendor":"siemens","product":"simatic_itp1000_firmware"},{"vendor":"siemens","product":"simatic ipc277g pro"},{"vendor":"siemens","product":"siplus ipc427e"}],"references":[{"url":"https://www.insyde.com/products","tags":["x_refsource_MISC","x_transferred","Product","Vendor Advisory"]},{"url":"https://www.insyde.com/security-pledge","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20220222-0005/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://www.kb.cert.org/vuls/id/796611"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-306654.html"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5953"},{"url":"https://security.netapp.com/advisory/ntap-20220222-0005"},{"url":"https://github.com/advisories/GHSA-f8pw-77pg-8gv6"}],"sources":{"cve":[{"id":"CVE-2020-5953","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).","status":"published","published":"2022-02-03T01:00:57Z","modified":"2026-08-11T12:22:02.148Z","updated_at":"2026-11-02T14:35:47.56691Z"}],"euvd":[{"id":"EUVD-2020-27107","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).","status":"published","published":"2022-02-03T01:00:57Z","modified":"2026-08-11T12:22:02Z","updated_at":"2026-11-02T18:02:00.294626Z"}],"ghsa":[{"id":"GHSA-f8pw-77pg-8gv6","title":"A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware...","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).","status":"published","published":"2022-02-10T00:01:02Z","modified":"2026-08-11T15:30:32Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:10:17.025827Z"}],"nvd":[{"id":"CVE-2020-5953","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).","status":"published","published":"2022-02-03T01:15:07.647Z","modified":"2026-08-11T13:17:18.953Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.9,"vector":"AV:L/AC:M/Au:N/C:C/I:C/A:C","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:46.951463Z"}]}}