CVE-2021-26411 — 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-2021-26411HIGH

Microsoft Internet Explorer 11 — Internet Explorer Memory Corruption Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  H  L    8.8   .8067   99.6   YES

AFFECTED
  Product                          Versions  Fixed
  Internet Explorer 11             1.0.0 –   —
  Internet Explorer 9              1.0.0 –   —
  Microsoft Edge (EdgeHTML-based)  1.0..0 –  —

TIMELINE
  Jan 29  Reserved by microsoft
  Nov 3   Added to CISA KEV, remediation due 2021-11-17
  Nov 3   Published (CNA: microsoft)

CWE-416 · CNA: microsoft · CVSS v3.1 · 3 references · NVD status: Analyzed · KEV due November 17, 2021

Description

Internet Explorer Memory Corruption Vulnerability

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 29, 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 — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Internet Explorer 11	—	1.0.0	—
Microsoft	Internet Explorer 9	—	1.0.0	—
Microsoft	Microsoft Edge (EdgeHTML-based)	—	1.0..0	—

Weaknesses

CWE-416

References (3)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26411 [vendor-advisory, patch]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26411 [x_refsource_MISC, x_transferred]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26411 [government-resource]

Authoritative record: CVE-2021-26411 at cve.org

Vendors: microsoft

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-26411 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.