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CVE Record

CVE-2021-45969: An issue was discovered in AhciBusDxe in Insyde InsydeH2O with kernel 5.1 before 05.16.25, 5.2 before 05.26...

An issue was discovered in AhciBusDxe in Insyde InsydeH2O with kernel 5.1 before 05.16.25, 5.2 before 05.26.25, 5.3 before 05.35.25, 5.4 before 05.43.25, and 5.5 before 05.51.25. A vulnerability exists in the SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer (the CommBuffer+8 location).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a firmware-level weakness in InsydeH2O affecting certain 5.1 through 5.5 kernel builds. The vulnerable SMM handler may trust an attacker-controlled buffer pointer too much. Business exposure depends on whether your hardware vendor shipped affected Insyde firmware.

Executive priority

Treat this as a firmware risk requiring inventory-driven validation, not broad emergency action. Prioritize confirming whether business-critical hardware uses affected InsydeH2O firmware, then apply OEM firmware updates where available.

Technical view

AhciBusDxe registers a SWSMI handler in System Management Mode that insufficiently validates the allocated buffer pointer at CommBuffer+8. The CVE lists affected InsydeH2O kernel lines before 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 for 5.1 through 5.5 respectively.

Likely exposure

Likely exposure is firmware-dependent. Organizations should check laptops, servers, appliances, and industrial devices whose OEM firmware uses InsydeH2O kernel 5.1 through 5.5 below the listed build thresholds. The bundle does not provide a complete affected product list.

Exploitation context

The source bundle does not cite active exploitation, and the CVE is not marked CISA KEV. Because the flaw is in SMM firmware code, successful abuse would likely matter most on systems where an attacker already has meaningful local access. Specific exploit prerequisites are not provided.

Researcher notes

The provided record identifies the vulnerable component and pointer validation location but lacks CVSS, CWE, complete product mapping, and exploit detail. Analysis should stay anchored to firmware version thresholds and downstream OEM advisories.

Mitigation direction

  • Inventory hardware using InsydeH2O firmware and affected kernel lines.
  • Check OEM, Insyde, CERT, Siemens, and NetApp advisories for applicable firmware updates.
  • Update firmware to vendor-approved fixed releases when available.
  • Prioritize internet-managed, privileged-user, industrial, and high-value endpoint populations.
  • Track vendor advisories because product-specific impact is incomplete in the CVE bundle.

Validation and detection

  • Confirm firmware vendor and InsydeH2O kernel version from OEM inventory data.
  • Map device models against OEM advisories referencing CVE-2021-45969.
  • Verify installed firmware is not below the listed fixed kernel build thresholds.
  • Review vulnerability scanner findings against actual device model and firmware version.
  • Document exceptions where the OEM has not confirmed applicability or remediation.
Prepared
Confidence
medium
Sources
6

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-2021-45969 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
5Source 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.