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CVE Record

CVE-2021-42059: An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.08.41, Kernel 5.1 before 05.16.41, Kernel...

An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.08.41, Kernel 5.1 before 05.16.41, Kernel 5.2 before 05.26.41, Kernel 5.3 before 05.35.41, and Kernel 5.4 before 05.42.20. A stack-based buffer overflow leads toarbitrary code execution in UEFI DisplayTypeDxe DXE driver.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-42059 is a firmware flaw in InsydeH2O UEFI. A vulnerable display driver can overflow stack memory and allow arbitrary code execution before the operating system fully controls the machine. Business risk depends on whether affected firmware is present in deployed hardware.

Executive priority

Treat this as a high-priority firmware exposure review, not an emergency exploitation event. Prioritize identifying affected hardware and applying vendor firmware updates where available.

Technical view

The issue is a stack-based buffer overflow in the InsydeH2O UEFI DisplayTypeDxe DXE driver. Affected ranges include Kernel 5.0 before 05.08.41, 5.1 before 05.16.41, 5.2 before 05.26.41, 5.3 before 05.35.41, and 5.4 before 05.42.20.

Likely exposure

Exposure is likely through OEM, appliance, or embedded systems that ship InsydeH2O firmware in the affected kernel ranges. The provided sources do not enumerate all affected end products, so asset validation must rely on firmware inventory and vendor advisories.

Exploitation context

The source bundle does not show CISA KEV listing, active exploitation, public exploit use, or CVSS scoring. The impact remains serious because arbitrary code execution in UEFI firmware can occur below normal operating-system security controls.

Researcher notes

Key evidence gaps are missing CVSS, no CWE assignment in the bundle, and no complete affected-product list. Research should focus on firmware version mapping, OEM advisories, and whether DisplayTypeDxe is present in shipped images.

Mitigation direction

  • Check Insyde advisory SA-2022006 and OEM firmware guidance for affected platforms.
  • Update firmware beyond the fixed InsydeH2O kernel version for the relevant kernel branch.
  • Prioritize systems where firmware updates are available from the hardware vendor.
  • Track NetApp, Siemens, and CERT/CC advisories for vendor-specific exposure notes.

Validation and detection

  • Inventory deployed systems for InsydeH2O firmware and kernel branch versions.
  • Compare firmware versions against the affected ranges listed for CVE-2021-42059.
  • Review OEM release notes for references to SA-2022006 or CVE-2021-42059.
  • Confirm firmware updates were applied and recorded in asset management.
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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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 · low confidence lookup

CVE-2021-42059 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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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.