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-2020-1020

CVE-2020-1020HIGH

Microsoft Windows

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .6504   99.2   YES

AFFECTED
  Product                                                  Versions                              Fixed
  Windows                                                  10 Version 1803 for 32-bit Systems –  —
  Windows Server                                           version 1803  (Core Installation) –   —
  Windows 10 Version 1909 for 32-bit Systems               unspecified –                         —
  Windows 10 Version 1909 for x64-based Systems            unspecified –                         —
  Windows 10 Version 1909 for ARM64-based Systems          unspecified –                         —
  Windows Server, version 1909 (Server Core installation)  unspecified –                         —
  Windows 10 Version 1903 for 32-bit Systems               unspecified –                         —
  Windows 10 Version 1903 for x64-based Systems            unspecified –                         —
  Windows 10 Version 1903 for ARM64-based Systems          unspecified –                         —
  Windows Server, version 1903 (Server Core installation)  unspecified –                         —

TIMELINE
  Nov 4   Reserved by microsoft
  Apr 15  Published (CNA: microsoft)
  Nov 3   Added to CISA KEV, remediation due 2022-05-03

CWE-787 · CNA: microsoft · CVSS v3.1 · 2 references · KEV due May 3, 2022

Description

A remote code execution vulnerability exists in Microsoft Windows when the Windows Adobe Type Manager Library improperly handles a specially-crafted multi-master font - Adobe Type 1 PostScript format.For all systems except Windows 10, an attacker who successfully exploited the vulnerability could execute code remotely, aka 'Adobe Font Manager Library Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-0938.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
November 4, 2019	Reserved	Reserved by microsoft
April 15, 2020	Published	Published (CNA: microsoft)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2022-05-03

Affected

Affected products and packages — 10 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows	—	10 Version 1803 for 32-bit Systems	—
Microsoft	Windows Server	—	version 1803 (Core Installation)	—
Microsoft	Windows 10 Version 1909 for 32-bit Systems	—	unspecified	—
Microsoft	Windows 10 Version 1909 for x64-based Systems	—	unspecified	—
Microsoft	Windows 10 Version 1909 for ARM64-based Systems	—	unspecified	—
Microsoft	Windows Server, version 1909 (Server Core installation)	—	unspecified	—
Microsoft	Windows 10 Version 1903 for 32-bit Systems	—	unspecified	—
Microsoft	Windows 10 Version 1903 for x64-based Systems	—	unspecified	—
Microsoft	Windows 10 Version 1903 for ARM64-based Systems	—	unspecified	—
Microsoft	Windows Server, version 1903 (Server Core installation)	—	unspecified	—

Weaknesses

CWE-787

References (2)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1020 [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1020 [government-resource]

Authoritative record: CVE-2020-1020 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-2020-1020 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.