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CVE Record

CVE-2021-41837: 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. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-41837 is a firmware-level flaw in Insyde InsydeH2O affecting AhciBusDxe in kernel versions 5.0 through 5.5. Successful exploitation could let an attacker reach System Management Mode, a highly privileged execution area below the operating system. Business urgency depends on whether your hardware or appliances use affected Insyde firmware.

Executive priority

Treat this as a targeted firmware risk rather than a broad internet-exposed emergency. Prioritize asset discovery first, then update affected systems through OEM firmware channels, especially infrastructure platforms where SMM compromise would have outsized operational impact.

Technical view

The CVE describes an untrusted pointer dereference in AhciBusDxe that can cause SMM memory corruption. The reported impact is writing fixed or predictable data to SMRAM, potentially escalating privileges to SMM. The source bundle does not provide CVSS, CWE, exact exploit prerequisites, or a complete affected-product list.

Likely exposure

Exposure is likely limited to systems, embedded products, or appliances containing Insyde InsydeH2O kernel 5.0 through 5.5. The bundle lists Siemens, NetApp, CERT/CC, and Insyde references, but does not identify every affected OEM product.

Exploitation context

The bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation would be serious because SMM compromise can bypass operating-system controls, but available evidence here does not define required access level, attack path, or public exploit maturity.

Researcher notes

Key gaps are exploit prerequisites, affected OEM matrix, CVSS, and patch specifics. Do not assume all InsydeH2O systems are affected; validate AhciBusDxe and kernel version exposure through vendor advisories and firmware metadata.

Mitigation direction

  • Inventory hardware and appliances for InsydeH2O firmware and kernel 5.0 through 5.5 exposure.
  • Check Insyde SA-2022024 and OEM advisories for device-specific firmware updates.
  • Apply only vendor-approved BIOS or firmware updates through supported channels.
  • Review Siemens and NetApp advisories if those products exist in your environment.
  • Prioritize critical servers, appliances, and endpoints with high trust or privileged roles.

Validation and detection

  • Confirm firmware vendor, BIOS package, and InsydeH2O kernel version from asset records.
  • Map affected devices against Insyde, CERT/CC, Siemens, and NetApp advisory scope.
  • Verify update status through OEM firmware inventory or endpoint management tooling.
  • Document unsupported devices where no vendor update is available.
  • Retest firmware version reporting after any BIOS or platform firmware update.
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

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CVE-2021-41837 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.