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CVE-2021-33625

RUGGEDCOM APE1808 - BIOS, SIMATIC Field PG M5

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.

CVSS
7.5
EPSS
0.32%
23.9% percentile
CISA KEV
Not listed
Published
2022.02.03
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.32%
Technical severityCVSS 7.5

Vulnerability overview

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 product and versions

Product
RUGGEDCOM APE1808 - BIOS, SIMATIC Field PG M5
Affected versions
< V1.0.202N, < V22.01.10, < V26.01.13, < V27.01.09, < V28.01.04, < V21.01.17, < V25.02.12, < V23.01.10, >= 5.1 < 5.16.23, >= 5.2 < 5.26.23, >= 5.3 < 5.35.23, >= 5.4 < 5.43.22, >= 5.5 < 5.51.22
Fixed versions
5.16.23, 5.26.23, 5.35.23, 5.43.22, 5.51.22

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that RUGGEDCOM APE1808 - BIOS, SIMATIC Field PG M5 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-119