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.
AV AC PR UI S C I A CVSS EPSS %ile KEV L L H N C H H H 8.2 .0035 28.3 —
AFFECTED Product Versions Fixed n/a n/a – —
TIMELINE Nov 3 Reserved by mitre Feb 3 Published (CNA: mitre) Aug 11 ENRICHED — CVE-2021-43323. Received CVSS 8.2 and CPE data from NVD.
An issue was discovered in UsbCoreDxe in Insyde InsydeH2O with kernel 5.5 before 05.51.45, 5.4 before 05.43.45, 5.3 before 05.35.45, 5.2 before 05.26.45, 5.1 before 05.16.45, and 5.0 before 05.08.45. An SMM callout vulnerability allows an attacker to hijack execution flow of code running in System Management Mode. Exploiting this issue could lead to escalating privileges to SMM.
| Date | Event | Detail |
|---|---|---|
| November 3, 2021 | Reserved | Reserved by mitre |
| February 3, 2022 | Published | Published (CNA: mitre) |
| August 11, 2026 | ENRICHED | ENRICHED — CVE-2021-43323. Received CVSS 8.2 and CPE data from NVD. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| n/a | n/a | — | n/a | — |
Authoritative record: CVE-2021-43323 at cve.org
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-43323 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.