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 v4.0 Metrics
Exploitability
Attack VectorLocal
ComplexityHigh
RequirementsPresent
PrivilegesHigh
User InteractionNone
Threat
Exploit MaturityUnreported
Vulnerable System
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | nvd | AV: P→L, UI: A→N, VC: N→H, VI: N→H, VA: N→H | 0.0 → 4.0 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 0.0 |
Affected Software
| Vendor | Product | Version |
|---|
| insyde | insydeh2o | 5.12.09.0074 |
| insyde | insydeh2o | 5.23.04.0045 |
| insyde | insydeh2o | 5.23.45.0023 |
| insyde | insydeh2o | 5.33.15.0034 |
| insyde | insydeh2o | 5.34.03.0029 |
| insyde | insydeh2o | 5.42.03.0010 |
| siemens | ruggedcom_ape1808_firmware | All versions |
| siemens | simatic_field_pg_m5_firmware | All versions |
| siemens | simatic_field_pg_m6_firmware | All versions |
| siemens | simatic_ipc127e_firmware | All versions |
| siemens | simatic_ipc227g_firmware | All versions |
| siemens | simatic_ipc277g_firmware | All versions |
| siemens | simatic_ipc327g_firmware | All versions |
| siemens | simatic_ipc377g_firmware | All versions |
| siemens | simatic_ipc427e_firmware | All versions |
| siemens | simatic_ipc477e_firmware | All versions |
| siemens | simatic_ipc477e_pro_firmware | All versions |
| siemens | simatic_ipc627e_firmware | All versions |
| siemens | simatic_ipc647e_firmware | All versions |
| siemens | simatic_ipc677e_firmware | All versions |
| siemens | simatic_ipc847e_firmware | All versions |
| siemens | simatic_itp1000_firmware | All versions |
Published: 2022-02-03
