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.
CVSS EPSS %ile KEV — .9966 99.9 YES
AFFECTED Product Versions Fixed HTTP Protocol Stack unspecified —
TIMELINE Apr 6 Added to CISA KEV, remediation due 2022-04-27 Apr 6 Published
| Date | Event | Detail |
|---|---|---|
| April 6, 2022 | KEV ADDED | Added to CISA KEV, remediation due 2022-04-27 |
| April 6, 2022 | Published | Published |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| Microsoft | HTTP Protocol Stack | — | — | — |
No references recorded.
Authoritative record: CVE-2021-31166 at cve.org
Vendors: microsoft
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-31166 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.