CVSS 3.1
7.5 highCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:HCVE-2020-5953
High (7.5). EPSS 0.3% chance of exploitation in the next 30 days.
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
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-31)
- Published
- Modified
- Record from
- the NVD, synced
Affected
- 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