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CVE Record

CVE-2021-43615: An issue was discovered in HddPassword in Insyde InsydeH2O with kernel 5.1 before 05.16.23, 5.2 before 05.2...

An issue was discovered in HddPassword in Insyde InsydeH2O with kernel 5.1 before 05.16.23, 5.2 before 05.26.23, 5.3 before 05.35.23, 5.4 before 05.43.22, and 5.5 before 05.51.22. An SMM memory corruption vulnerability allows an attacker 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

This is a firmware-level weakness in InsydeH2O BIOS code. If exploitable on an affected device, it could let an attacker move into System Management Mode, a highly privileged CPU mode below the operating system. That can undermine OS-level security controls and persistence assumptions.

Executive priority

Treat this as a high-priority firmware remediation item where affected InsydeH2O devices are present. The business risk is not broad internet exposure, but compromise below the operating system on vulnerable hardware.

Technical view

CVE-2021-43615 affects the HddPassword component in Insyde InsydeH2O kernel 5.1 through 5.5 before listed fixed builds. The issue is SMM memory corruption that allows fixed or predictable data writes to SMRAM, potentially escalating privileges to SMM.

Likely exposure

Exposure is likely limited to systems, appliances, or OEM products shipping affected InsydeH2O firmware branches. The bundle does not enumerate specific affected product models, so validation must be tied to device vendor firmware advisories and deployed firmware versions.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation evidence. Public description states exploitation could escalate privileges to SMM, but the provided sources do not include exploit prerequisites, CVSS, or product-specific exploitability detail.

Researcher notes

Important gaps remain: CVSS, CWE, CPEs, and detailed product lists are absent in the provided CVE data. Analysis should stay anchored to Insyde SA-2022013 and downstream vendor advisories when determining exposure and remediation status.

Mitigation direction

  • Apply vendor-provided BIOS or firmware updates that include the fixed InsydeH2O kernel builds.
  • Review Insyde SA-2022013 and downstream advisories from affected device vendors.
  • Prioritize firmware updates on high-trust endpoints, appliances, and management infrastructure.
  • If no update is available, follow device vendor guidance; no workaround is specified in the bundle.

Validation and detection

  • Inventory systems using Insyde InsydeH2O firmware and record firmware kernel branch and build.
  • Compare kernel versions against the fixed build thresholds listed in the CVE description.
  • Check OEM, NetApp, Siemens, and CERT/CC advisories for product-specific applicability.
  • After updating, confirm the deployed firmware build includes the vendor security fix.
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-2021-43615 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.