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-2021-34448

CVE-2021-34448MEDIUM

Microsoft Windows 10 Version 1507 — Scripting Engine Memory Corruption Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   R  U  H  H  N    6.8   .4006   98.6   YES

AFFECTED
  Product                   Versions        Fixed
  Windows 10 Version 1507   10.0.10240.0 –  —
  Windows 10 Version 1607   10.0.14393.0 –  —
  Windows 10 Version 1809   10.0.17763.0 –  —
  Windows 10 Version 1809   10.0.0 –        —
  Windows 10 Version 1909   10.0.0 –        —
  Windows 10 Version 2004   10.0.0 –        —
  Windows 10 Version 20H2   10.0.0 –        —
  Windows 10 Version 21H1   10.0.0 –        —
  Windows 7                 6.1.0 –         —
  Windows 7 Service Pack 1  6.1.0 –         —
  + 6 more

TIMELINE
  Jun 9   Reserved by microsoft
  Nov 3   Added to CISA KEV, remediation due 2021-11-17
  Nov 3   Published (CNA: microsoft)

CWE-787 · CNA: microsoft · CVSS v3.1 · 3 references · NVD status: Analyzed · KEV due November 17, 2021

Description

Scripting Engine Memory Corruption Vulnerability

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 9, 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 — 16 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 10 Version 1507	—	10.0.10240.0	—
Microsoft	Windows 10 Version 1607	—	10.0.14393.0	—
Microsoft	Windows 10 Version 1809	—	10.0.17763.0	—
Microsoft	Windows 10 Version 1809	—	10.0.0	—
Microsoft	Windows 10 Version 1909	—	10.0.0	—
Microsoft	Windows 10 Version 2004	—	10.0.0	—
Microsoft	Windows 10 Version 20H2	—	10.0.0	—
Microsoft	Windows 10 Version 21H1	—	10.0.0	—
Microsoft	Windows 7	—	6.1.0	—
Microsoft	Windows 7 Service Pack 1	—	6.1.0	—
Microsoft	Windows 8.1	—	6.3.0	—
Microsoft	Windows Server 2008 R2 Service Pack 1	—	6.1.7601.0	—
Microsoft	Windows Server 2012	—	6.2.9200.0	—
Microsoft	Windows Server 2012 R2	—	6.3.9600.0	—
Microsoft	Windows Server 2016	—	10.0.14393.0	—
Microsoft	Windows Server 2019	—	10.0.17763.0	—

Weaknesses

CWE-787

References (3)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34448 [Patch, Vendor Advisory]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448 [Patch, Vendor Advisory]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34448 [US Government Resource]

Authoritative record: CVE-2021-34448 at cve.org

Vendors: microsoft

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-34448 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.