CVE-2021-45970 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-45970HIGH

n/a n/a — 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 b…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   H   N  C  H  H  H    8.2   .0033   25.5     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Jan 1   Reserved by mitre
  Jan 5   Published (CNA: mitre)
  Aug 11  ENRICHED — CVE-2021-45970. Received CVSS 8.2 and CPE data from NVD.

CWE-787 · CNA: mitre · CVSS v3.1 · 5 references · NVD status: Modified

Description

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).

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 1, 2022	Reserved	Reserved by mitre
January 5, 2022	Published	Published (CNA: mitre)
August 11, 2026	ENRICHED	ENRICHED — CVE-2021-45970. Received CVSS 8.2 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-787

References (5)

https://cert-portal.siemens.com/productcert/html/ssa-306654.html
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20220216-0004/ [Third Party Advisory]
https://www.insyde.com/security-pledge [Vendor Advisory]
https://www.kb.cert.org/vuls/id/796611

Authoritative record: CVE-2021-45970 at cve.org

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-45970 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.