CVE-2021-33625: insyde insydeh2o

Vulnerability summary

CVE-2021-33625 is a high (CVSS 7.5) vulnerability in insyde insydeh2o. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 22.8% of scored vulnerabilities.

Timeline

1. 03-02-2022
   PublishedVulnerability first disclosed.
2. 11-08-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.