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CVE-2021-41838

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.

CVSS
8.2
EPSS
0.30%
22.5% 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 probability0.30%
Technical severityCVSS 8.2

Vulnerability overview

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.

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 < 5.16.42, >= 5.2 < 5.26.42, >= 5.3 < 5.35.42, >= 5.4 < 5.43.42, >= 5.5 < 5.51.42
Fixed versions
5.16.42, 5.26.42, 5.35.42, 5.43.42, 5.51.42

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:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-119