CVE-2021-33625: Insyde INSYDEH2O

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue was discovered in Kernel 5.x in Insyde InsydeH2O, affecting HddPassword. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.

Affected products

• Insyde INSYDEH2O: from 5.1, before 5.16.23 (fixed in 5.16.23); from 5.2, before 5.26.23 (fixed in 5.26.23); from 5.3, before 5.35.23 (fixed in 5.35.23); from 5.4, before 5.43.22 (fixed in 5.43.22); from 5.5, before 5.51.22 (fixed in 5.51.22)
• Netapp Fas/aff BIOS: affected versions not specified
• Siemens Ruggedcom APE1808 Firmware: affected versions not specified
• Siemens SIMATIC Field Pg m5 Firmware: affected versions not specified
• Siemens SIMATIC Field Pg m6 Firmware: affected versions not specified
• Siemens SIMATIC IPC127E Firmware: affected versions not specified
• Siemens SIMATIC IPC227G Firmware: affected versions not specified
• Siemens SIMATIC IPC277G Firmware: affected versions not specified
• Siemens SIMATIC IPC327G Firmware: affected versions not specified
• Siemens SIMATIC IPC377G Firmware: affected versions not specified
• Siemens SIMATIC IPC427E Firmware: affected versions not specified
• Siemens SIMATIC IPC477E Firmware: affected versions not specified
• Siemens SIMATIC IPC477E Pro Firmware: affected versions not specified
• Siemens SIMATIC IPC627E Firmware: affected versions not specified
• Siemens SIMATIC IPC647E Firmware: affected versions not specified
• Siemens SIMATIC IPC677E Firmware: affected versions not specified
• Siemens SIMATIC IPC847E Firmware: affected versions not specified
• Siemens SIMATIC ITP1000 Firmware: affected versions not specified

Published 2022-02-03. Last modified 2026-08-11.