LiveActive security incident?Get immediate response
CVE Record

CVE-2021-45970: An issue was discovered in IdeBusDxe in Insyde InsydeH2O with kernel 5.1 before 05.16.25, 5.2 before 05.26....

An issue was discovered in IdeBusDxe 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 status code saved at the CommBuffer+4 location).

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-45970 is a firmware issue in Insyde InsydeH2O affecting specific 5.x kernel branches before listed fixed releases. The vulnerable code runs in System Management Mode, a highly privileged firmware context. The public bundle does not provide a CVSS score, exploit status, or direct business impact details.

Executive priority

Give this measured priority for asset identification and firmware update planning. The privileged firmware context is important, but public evidence here does not establish active exploitation or a scored severity.

Technical view

IdeBusDxe registers an SWSMI handler in the SMM branch that insufficiently validates an allocated buffer pointer, specifically status data at CommBuffer+4. Affected InsydeH2O kernel branches are 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.

Likely exposure

Exposure is most likely in systems, appliances, or embedded products whose OEM firmware includes affected InsydeH2O kernel branches. The bundle lists downstream advisories from NetApp and Siemens, but does not identify all affected models in the provided data.

Exploitation context

The source bundle does not show CISA KEV listing, active exploitation, public exploit use, or attacker prerequisites. Treat this as a firmware supply-chain exposure requiring vendor confirmation rather than assuming internet-facing exploitability.

Researcher notes

The key validation point is whether a platform includes affected IdeBusDxe code from the listed InsydeH2O branches. The public bundle lacks CVSS, CWE, exploitability notes, and complete affected product mapping, so downstream vendor advisories are essential.

Mitigation direction

  • Check OEM, Insyde, NetApp, and Siemens guidance for affected models.
  • Update firmware to vendor releases containing the relevant fixed InsydeH2O kernel baseline.
  • Prioritize devices where firmware integrity is security-critical or difficult to monitor.
  • Track exceptions where OEM firmware updates are unavailable or deferred.

Validation and detection

  • Inventory firmware vendors and InsydeH2O kernel versions across managed hardware.
  • Compare versions against the fixed branch thresholds in the CVE description.
  • Review NetApp and Siemens advisories for product-specific applicability.
  • Confirm deployed firmware versions after any update or maintenance window.
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

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

cve · low confidence lookup

CVE-2021-45970 mapping review

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

Open ATT&CK lookup
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.