Microsoft Windows
CVE-2020-1520 — Windows Font Driver Host Remote Code Execution Vulnerability
Executive Summary
A remote code execution vulnerability exists when the Windows Font Driver Host improperly handles memory. An attacker who successfully exploited the vulnerability would gain execution on a victim system. The security update addresses the vulnerability by correcting how the Windows Font Driver Host handles memory.
Overview
7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
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
0.00901
probability of exploitation in the next 30 days
0.5497 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
30 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4571692 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 for x64-based Systems | 4571692 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4571694 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4571694 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4571741 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4571741 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4571741 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4571709 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4571709 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4571709 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4565349 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4565349 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4565349 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4565351 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4565351 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4565351 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4565351 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4565351 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4565351 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 4566782 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 4566782 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 2004 for x64-based Systems | 4566782 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4571729 (Monthly Rollup) 4571719 (Security Only) Important Remote Code Execution 4565524 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571729 4571719 Windows 7 for x64-based Systems Service Pack 1 4571729 (Monthly Rollup) 4571719 (Security Only) Important Remote Code Execution 4565524 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571729 4571719 Windows 8.1 for 32-bit systems 4571703 (Monthly Rollup) 4571723 (Security Only) Important Remote Code Execution 4565541 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571703 4571723 Windows 8.1 for x64-based systems 4571703 (Monthly Rollup) 4571723 (Security Only) Important Remote Code Execution 4565541 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571703 4571723 Windows RT 8.1 | 4571703 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 4571730 (Monthly Rollup) 4571746 (Security Only) Important Remote Code Execution 4565536 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571730 4571746 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4571730 (Monthly Rollup) 4571746 (Security Only) Important Remote Code Execution 4565536 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571730 4571746 Windows Server 2008 for x64-based Systems Service Pack 2 4571730 (Monthly Rollup) 4571746 (Security Only) Important Remote Code Execution 4565536 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571730 4571746 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4571730 (Monthly Rollup) 4571746 (Security Only) Important Remote Code Execution 4565536 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571730 4571746 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4571729 (Monthly Rollup) 4571719 (Security Only) Important Remote Code Execution 4565524 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571729 4571719 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4571729 (Monthly Rollup) 4571719 (Security Only) Important Remote Code Execution 4565524 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571729 4571719 Windows Server 2012 4571736 (Monthly Rollup) 4571702 (Security Only) Important Remote Code Execution 4565537 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571736 4571702 Windows Server 2012 (Server Core installation) 4571736 (Monthly Rollup) 4571702 (Security Only) Important Remote Code Execution 4565537 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571736 4571702 Windows Server 2012 R2 4571703 (Monthly Rollup) 4571723 (Security Only) Important Remote Code Execution 4565541 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571703 4571723 Windows Server 2012 R2 (Server Core installation) 4571703 (Monthly Rollup) 4571723 (Security Only) Important Remote Code Execution 4565541 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes 4571703 4571723 Windows Server 2016 | 4571694 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 (Server Core installation) | 4571694 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 | 4565349 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 (Server Core installation) | 4565349 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1903 (Server Core installation) | 4565351 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 1909 (Server Core installation) | 4565351 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server, version 2004 (Server Core installation) | 4566782 (Security Update) |
Important | Remote Code Execution | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
4571692 |
Security Update | Yes |
4571694 |
Security Update | Yes |
4571741 |
Security Update | Yes |
4571709 |
Security Update | Yes |
4565349 |
Security Update | Yes |
4565351 |
Security Update | Yes |
4566782 |
Security Update | Yes |
4571703 |
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
Keqi Hu, Trend Micro's Zero Day Initiative
References
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