.NET Framework
CVE-2020-1476 — ASP.NET and .NET Elevation of Privilege Vulnerability
Executive Summary
An elevation of privilege vulnerability exists when ASP.NET or .NET web applications running on IIS improperly allow access to cached files. An attacker who successfully exploited this vulnerability could gain access to restricted files. To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server. The update addresses the vulnerability by changing how ASP.NET and .NET handle requests.
Overview
5.5
CVSS MEDIUM
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:N/A:N
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
EPSS Score
0.01129
probability of exploitation in the next 30 days
0.62164 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
44 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2 4570509 (Monthly Rollup) 4570503 (Security Only) Important Elevation of Privilege 4566520 Base: N/A Temporal: N/A Vector: N/A Maybe 4570503 Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 4570509 (Monthly Rollup) 4570503 (Security Only) Important Elevation of Privilege 4566520 Base: N/A Temporal: N/A Vector: N/A Maybe 4570503 Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems | 4571694 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems | 4571694 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 | 4571694 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation) | 4571694 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for 32-bit Systems | 4571692 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for x64-based Systems | 4571692 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems | 4571741 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for ARM64-based Systems | 4571741 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems | 4571741 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems | 4571709 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for ARM64-based Systems | 4571709 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems | 4571709 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation) | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems | 4569751 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for ARM64-based Systems | 4569751 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems | 4569751 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems | 4569751 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for ARM64-based Systems | 4569751 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems | 4569751 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for 32-bit Systems | 4569745 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for ARM64-based Systems | 4569745 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for x64-based Systems | 4569745 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation) | 4570505 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation) | 4569751 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation) | 4569751 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 2004 (Server Core installation) | 4569745 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 3.5 on Windows 8.1 for 32-bit systems 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows 8.1 for x64-based systems 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2012 4570507 (Monthly Rollup) 4570501 (Security Only) Important Elevation of Privilege 4566518 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation) 4570507 (Monthly Rollup) 4570501 (Security Only) Important Elevation of Privilege 4566518 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2012 R2 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation) 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.5.2 on Windows 7 for 32-bit Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.5.2 on Windows 7 for x64-based Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.5.2 on Windows 8.1 for 32-bit systems 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows 8.1 for x64-based systems 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows RT 8.1 | 4570508 (Monthly Rollup) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2008 for 32-bit Systems Service Pack 2 4570509 (Monthly Rollup) 4570503 (Security Only) Important Elevation of Privilege 4566520 Base: N/A Temporal: N/A Vector: N/A Maybe 4570503 Microsoft .NET Framework 4.5.2 on Windows Server 2008 for x64-based Systems Service Pack 2 4570509 (Monthly Rollup) 4570503 (Security Only) Important Elevation of Privilege 4566520 Base: N/A Temporal: N/A Vector: N/A Maybe 4570503 Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.5.2 on Windows Server 2012 4570507 (Monthly Rollup) 4570501 (Security Only) Important Elevation of Privilege 4566518 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2012 (Server Core installation) 4570507 (Monthly Rollup) 4570501 (Security Only) Important Elevation of Privilege 4566518 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 (Server Core installation) 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.6 on Windows Server 2008 for 32-bit Systems Service Pack 2 4570509 (Monthly Rollup) 4570503 (Security Only) Important Elevation of Privilege 4566520 Base: N/A Temporal: N/A Vector: N/A Maybe 4570503 Microsoft .NET Framework 4.6 on Windows Server 2008 for x64-based Systems Service Pack 2 4570509 (Monthly Rollup) 4570503 (Security Only) Important Elevation of Privilege 4566520 Base: N/A Temporal: N/A Vector: N/A Maybe 4570503 Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for x64-based Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for x64-based systems 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows RT 8.1 | 4570508 (Monthly Rollup) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 4570507 (Monthly Rollup) 4570501 (Security Only) Important Elevation of Privilege 4566518 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation) 4570507 (Monthly Rollup) 4570501 (Security Only) Important Elevation of Privilege 4566518 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation) 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems | 4569746 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems | 4569746 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems | 4569748 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems | 4569748 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems | 4569749 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems | 4569749 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.8 on Windows RT 8.1 | 4570508 (Monthly Rollup) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4570506 (Monthly Rollup) 4570500 (Security Only) Important Elevation of Privilege 4566517 Base: N/A Temporal: N/A Vector: N/A Maybe 4570500 Microsoft .NET Framework 4.8 on Windows Server 2012 4570507 (Monthly Rollup) 4570501 (Security Only) Important Elevation of Privilege 4566518 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation) 4570507 (Monthly Rollup) 4570501 (Security Only) Important Elevation of Privilege 4566518 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.8 on Windows Server 2012 R2 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation) 4570508 (Monthly Rollup) 4570502 (Security Only) Important Elevation of Privilege 4566519 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.8 on Windows Server 2016 | 4569746 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation) | 4569746 (Security Update) |
Important | Elevation of Privilege | Maybe |
Patches
11 patches
| Article | Type | Restart |
|---|---|---|
4571694 |
Security Update | Yes |
4571692 |
Security Update | Yes |
4571741 |
Security Update | Yes |
4571709 |
Security Update | Yes |
4570505 |
Security Update | Maybe |
4569751 |
Security Update | Maybe |
4569745 |
Security Update | Maybe |
4570508 |
Monthly Rollup | Maybe |
4569746 |
Security Update | Maybe |
4569748 |
Security Update | Maybe |
4569749 |
Security Update | Maybe |
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
References
On This Page