.NET Framework
CVE-2020-16937 — .NET Framework Information Disclosure Vulnerability
Executive Summary
An information disclosure vulnerability exists when the .NET Framework improperly handles objects in memory. An attacker who successfully exploited the vulnerability could disclose contents of an affected system's memory. To exploit the vulnerability, an authenticated attacker would need to run a specially crafted application. The update addresses the vulnerability by correcting how the .NET Framework handles objects in memory.
Overview
4.7
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
Temporal Score: 4.2
EPSS Score
0.03045
probability of exploitation in the next 30 days
0.85823 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
89 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 | 4580470 (Security Only) 4579980 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 | 4580470 (Security Only) 4579980 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| 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 | 4580346 (Security Update) |
Important | Information Disclosure | 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 | 4580346 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 | 4580346 (Security Update) |
Important | Information Disclosure | 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) | 4580346 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for 32-bit Systems | 4580327 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for x64-based Systems | 4580327 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems | 4580328 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for ARM64-based Systems | 4580328 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems | 4580328 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems | 4580330 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for ARM64-based Systems | 4580330 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems | 4580330 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation) | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems | 4578974 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for ARM64-based Systems | 4578974 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems | 4578974 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems | 4578974 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for ARM64-based Systems | 4578974 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems | 4578974 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for 32-bit Systems | 4578968 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for ARM64-based Systems | 4578968 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for x64-based Systems | 4578968 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation) | 4579976 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation) | 4578974 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation) | 4578974 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 2004 (Server Core installation) | 4578968 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows 8.1 for 32-bit systems | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows 8.1 for x64-based systems | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows Server 2012 | 4580468 (Security Only) 4579978 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation) | 4580468 (Security Only) 4579978 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows Server 2012 R2 | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation) | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows 7 for 32-bit Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows 7 for x64-based Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows 8.1 for 32-bit systems | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows 8.1 for x64-based systems | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows RT 8.1 | 4579979 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2008 for 32-bit Systems Service Pack 2 | 4580470 (Security Only) 4579980 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2008 for x64-based Systems Service Pack 2 | 4580470 (Security Only) 4579980 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2012 | 4580468 (Security Only) 4579978 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2012 (Server Core installation) | 4580468 (Security Only) 4579978 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 (Server Core installation) | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.6 on Windows Server 2008 for 32-bit Systems Service Pack 2 | 4578963 (Monthly Rollup) 4580470 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.6 on Windows Server 2008 for x64-based Systems Service Pack 2 | 4578963 (Monthly Rollup) 4580470 (Security Only) |
Important | Information Disclosure | Maybe |
| 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 | 4578963 (Monthly Rollup) 4580467 (Security Only) |
Important | Information Disclosure | Maybe |
| 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 | 4578963 (Monthly Rollup) 4580467 (Security Only) |
Important | Information Disclosure | Maybe |
| 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 | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| 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 | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows RT 8.1 | 4579979 (Monthly Rollup) |
Important | Information Disclosure | 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 | 4578963 (Monthly Rollup) 4580467 (Security Only) |
Important | Information Disclosure | 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 (Server Core installation) | 4578963 (Monthly Rollup) 4580467 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 | 4578961 (Monthly Rollup) 4580468 (Security Only) |
Important | Information Disclosure | Maybe |
| 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) | 4578961 (Monthly Rollup) 4580468 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| 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) | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems | 4578969 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems | 4578969 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems | 4578971 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems | 4578971 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems | 4578972 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems | 4578972 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows RT 8.1 | 4579979 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 4580467 (Security Only) 4579977 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2012 | 4580468 (Security Only) 4579978 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation) | 4580468 (Security Only) 4579978 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2012 R2 | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation) | 4579979 (Monthly Rollup) 4580469 (Security Only) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2016 | 4578969 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation) | 4578969 (Security Update) |
Important | Information Disclosure | Maybe |
Patches
18 patches
| Article | Type | Restart |
|---|---|---|
4580470 (Security Only) 4579980 |
Security Only | Maybe |
4580346 |
Security Update | Yes |
4580327 |
Security Update | Yes |
4580328 |
Security Update | Yes |
4580330 |
Security Update | Yes |
4579976 |
Security Update | Maybe |
4578974 |
Security Update | Maybe |
4578968 |
Security Update | Maybe |
4579979 (Monthly Rollup) 4580469 |
Monthly Rollup | Maybe |
4580468 (Security Only) 4579978 |
Security Only | Maybe |
4580467 (Security Only) 4579977 |
Security Only | Maybe |
4579979 |
Monthly Rollup | Maybe |
4578963 (Monthly Rollup) 4580470 |
Monthly Rollup | Maybe |
4578963 (Monthly Rollup) 4580467 |
Monthly Rollup | Maybe |
4578961 (Monthly Rollup) 4580468 |
Monthly Rollup | Maybe |
4578969 |
Security Update | Maybe |
4578971 |
Security Update | Maybe |
4578972 |
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
Microsoft has not published researcher acknowledgments for this CVE, or they are not yet reflected in our data source. Check the MSRC advisory directly for the most current credit information.
References
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