Microsoft Graphics Component
CVE-2020-1020 — Adobe Font Manager Library Remote Code Execution Vulnerability
Executive Summary
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. For systems running Windows 10, an attacker who successfully exploited the vulnerability could execute code in an AppContainer sandbox context with limited privileges and capabilities. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. There are multiple ways an attacker could exploit the vulnerability, such as convincing a user to open a specially crafted document or viewing it in the Windows Preview pane. The update addresses the vulnerability by correcting how the Windows Adobe Type Manager Library handles Type1 fonts.
Overview
8.8
CVSS HIGH
Important
MS Severity
Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.0
EPSS Score
0.65037
probability of exploitation in the next 30 days
0.99149 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
27 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4550930 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 for x64-based Systems | 4550930 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4550929 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4550929 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4550927 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4550927 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4550927 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4550922 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4550922 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4550922 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4549949 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4549949 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4549949 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4549951 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4549951 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4549951 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4549951 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4549951 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4549951 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4550964 (Monthly Rollup) 4550965 (Security Only) Critical Remote Code Execution 4540688 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550964 4550965 Windows 7 for x64-based Systems Service Pack 1 4550964 (Monthly Rollup) 4550965 (Security Only) Critical Remote Code Execution 4540688 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550964 4550965 Windows 8.1 for 32-bit systems 4550961 (Monthly Rollup) 4550970 (Security Only) Critical Remote Code Execution 4541509 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550961 4550970 Windows 8.1 for x64-based systems 4550961 (Monthly Rollup) 4550970 (Security Only) Critical Remote Code Execution 4541509 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550961 4550970 Windows RT 8.1 | 4550961 (Monthly Rollup) |
Critical | Remote Code Execution | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 4550951 (Monthly Rollup) 4550957 (Security Only) Critical Remote Code Execution 4541506 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550951 4550957 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4550951 (Monthly Rollup) 4550957 (Security Only) Critical Remote Code Execution 4541506 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550951 4550957 Windows Server 2008 for x64-based Systems Service Pack 2 4550951 (Monthly Rollup) 4550957 (Security Only) Critical Remote Code Execution 4541506 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550951 4550957 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4550951 (Monthly Rollup) 4550957 (Security Only) Critical Remote Code Execution 4541506 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550951 4550957 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4550964 (Monthly Rollup) 4550965 (Security Only) Critical Remote Code Execution 4540688 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550964 4550965 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4550964 (Monthly Rollup) 4550965 (Security Only) Critical Remote Code Execution 4540688 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550964 4550965 Windows Server 2012 4550917 (Monthly Rollup) 4550971 (Security Only) Critical Remote Code Execution 4541510 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550917 4550971 Windows Server 2012 (Server Core installation) 4550917 (Monthly Rollup) 4550971 (Security Only) Critical Remote Code Execution 4541510 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550917 4550971 Windows Server 2012 R2 4550961 (Monthly Rollup) 4550970 (Security Only) Critical Remote Code Execution 4541509 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550961 4550970 Windows Server 2012 R2 (Server Core installation) 4550961 (Monthly Rollup) 4550970 (Security Only) Critical Remote Code Execution 4541509 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4550961 4550970 Windows Server 2016 | 4550929 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 (Server Core installation) | 4550929 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 | 4549949 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 (Server Core installation) | 4549949 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4550922 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1903 (Server Core installation) | 4549951 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1909 (Server Core installation) | 4549951 (Security Update) |
Important | Remote Code Execution | Yes |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
4550930 |
Security Update | Yes |
4550929 |
Security Update | Yes |
4550927 |
Security Update | Yes |
4550922 |
Security Update | Yes |
4549949 |
Security Update | Yes |
4549951 |
Security Update | Yes |
4550961 |
Monthly Rollup | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Google: Project Zero and Threat Analysis Group
References
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