Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2021-27085
Microsoft Internet Explorer 11 — Internet Explorer Remote Code Execution Vulnerability
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N R C L H L 8.8 .0545 92.5 YES
AFFECTED
Product Versions Fixed
Internet Explorer 11 1.0.0 – —
TIMELINE
Feb 10 Reserved by microsoft
Nov 3 Added to CISA KEV, remediation due 2021-11-17
Nov 3 Published (CNA: microsoft)
Description
Internet Explorer Remote Code Execution Vulnerability
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
| February 10, 2021 | Reserved | Reserved by microsoft |
| November 3, 2021 | KEV ADDED | Added to CISA KEV, remediation due 2021-11-17 |
| November 3, 2021 | Published | Published (CNA: microsoft) |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
| Microsoft | Internet Explorer 11 | — | 1.0.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-27085 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, October 7, 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.