CVE-2021-41838 evidence review
RUGGEDCOM APE1808 - BIOS, SIMATIC Field PG M5
An issue was discovered in SdHostDriver in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of a Numeric Range Comparison Without a Minimum Check.
This record remains available for product and version identification, but it is not presented as a complete remediation procedure. Confirm the affected range and the supported fix in a direct vendor advisory before changing production systems.
Identify the product and installed version
Record whether RUGGEDCOM APE1808 - BIOS, SIMATIC Field PG M5 is present, where it is installed, and which interfaces are exposed.
- Record the product name, package or appliance identifier, and installed version.
- Identify internet-facing, administrative, API, and internal access paths.
- Preserve the pre-change configuration and relevant service logs.
Compare the affected range
Use the current record as an identification aid: < 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 < 5.16.42, >= 5.2 < 5.26.42, >= 5.3 < 5.35.42, >= 5.4 < 5.43.42, >= 5.5 < 5.51.42. Resolve incomplete inventory results before deciding that an asset is unaffected.
Verify the authoritative remediation source
Open the linked source material and locate a direct vendor advisory for this CVE. Confirm the supported fixed release and product-specific update path before making a production change.
Operational boundary
This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.