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CVE Record

CVE-2021-41841: An issue was discovered in AhciBusDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O.

An issue was discovered in AhciBusDxe 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 Inclusion of Functionality from an Untrusted Control Sphere.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-41841 is a firmware-level flaw in Insyde InsydeH2O kernel 5.0 through 5.5. It could let an attacker reach System Management Mode and run arbitrary code, which is highly privileged and difficult to inspect. Public sources provided do not show active exploitation or a CVSS score.

Executive priority

Treat this as a high-priority firmware exposure review, especially for regulated, appliance-heavy, or long-life hardware environments. The business risk is not broad internet exposure; it is loss of trust in platform integrity where affected firmware is present.

Technical view

The issue is in AhciBusDxe and is described as an SMM callout caused by inclusion of functionality from an untrusted control sphere. The CVE states this can allow access to System Management Mode and arbitrary code execution. Affected product details are generic, so exposure depends on OEM firmware composition.

Likely exposure

Organizations may be exposed if their laptops, servers, appliances, or embedded systems use InsydeH2O firmware kernel 5.0 through 5.5 with the affected AhciBusDxe component. The bundle names InsydeH2O and links downstream advisories, but does not provide a complete product list.

Exploitation context

The source bundle does not cite CISA KEV listing or any confirmed in-the-wild exploitation. The impact is serious because SMM execution can undermine operating-system level controls, but the provided evidence does not describe attacker prerequisites, exploit maturity, or weaponized public exploitation.

Researcher notes

The record lacks CVSS, CWE, detailed affected CPEs, and explicit remediation text in the supplied bundle. Avoid assuming impact across all InsydeH2O systems. Validate through firmware bill of materials, OEM advisories, and vendor confirmation before declaring assets affected or remediated.

Mitigation direction

  • Check Insyde and OEM advisories for firmware guidance and fixed releases.
  • Inventory systems using InsydeH2O kernel 5.0 through 5.5.
  • Apply vendor-provided BIOS or firmware updates when available.
  • Review Siemens and NetApp advisories if those vendors are in your environment.
  • Escalate unknown firmware exposure to device vendors for confirmation.

Validation and detection

  • Identify firmware vendor, platform model, BIOS version, and InsydeH2O kernel version.
  • Confirm whether the firmware includes the AhciBusDxe component.
  • Compare asset models and firmware versions against vendor advisories.
  • Verify remediation through OEM release notes and post-update firmware version checks.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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CVE-2021-41841 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.