.NET Framework
CVE-2019-0545 — .NET Framework Information Disclosure Vulnerability
Executive Summary
An information disclosure vulnerability exists in .NET Framework and .NET Core which allows bypassing Cross-origin Resource Sharing (CORS) configurations. An attacker who successfully exploited the vulnerability could retrieve content, that is normally restricted, from a web application. The security update addresses the vulnerability by enforcing CORS configuration to prevent its bypass.
Overview
7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
EPSS Score
0.09611
probability of exploitation in the next 30 days
0.94966 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
46 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| .NET Core 2.1 | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| .NET Core 2.2 | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4471990 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4471990 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4471990 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4471990 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4471990 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4471990 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows 10 for 32-bit Systems | 4480962 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 for x64-based Systems | 4480962 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1607 for 32-bit Systems | 4480961 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1607 for x64-based Systems | 4480961 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1703 for 32-bit Systems | 4480973 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1703 for x64-based Systems | 4480973 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1709 for 32-bit Systems | 4480978 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1709 for ARM64-based Systems | 4480978 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1709 for x64-based Systems | 4480978 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for 32-bit Systems | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for ARM64-based Systems | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for x64-based Systems | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1809 for 32-bit Systems | 4480056 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows 10 Version 1809 for x64-based Systems | 4480056 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows 8.1 for 32-bit systems 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4467226; 4471983 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows 8.1 for x64-based systems 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4467226; 4471983 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2012 4481482 (Monthly Rollup) 4481483 (Security Only) Important Information Disclosure 4471988, 3142025 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation) 4481482 (Monthly Rollup) 4481483 (Security Only) Important Information Disclosure 4471988, 3142025 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2012 R2 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4467226; 4471983 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation) 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4467226; 4471983 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5 on Windows Server 2016 | 4480961 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows Server 2016 (Server Core installation) | 4480961 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows Server 2019 | 4480056 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows Server 2019 (Server Core installation) | 4480056 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 3.5 on Windows Server, version 1709 (Server Core Installation) | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5 on Windows Server, version 1803 (Server Core Installation) | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142024 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142024 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142024 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142024 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142024 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows 7 for 32-bit Systems Service Pack 1 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142033, 2972107 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows 7 for x64-based Systems Service Pack 1 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142033, 2972107 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows 8.1 for 32-bit systems 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4461989, 3142030, 2978041 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 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4461989, 3142030, 2978041 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows RT 8.1 | 4481484 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.5.2 on Windows Server 2008 for 32-bit Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4461990, 3142033, 2972107 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2008 for x64-based Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4461990, 3142033, 2972107 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142033, 2972107 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142033, 2972107 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2012 4481482 (Monthly Rollup) 4481483 (Security Only) Important Information Disclosure 4461988, 3142032, 2978042 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2012 (Server Core installation) 4481482 (Monthly Rollup) 4481483 (Security Only) Important Information Disclosure 4461988, 3142032, 2978042 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4461989, 3142030, 2978041 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) 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4461989, 3142030, 2978041 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 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4471990, 3142037 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.6 on Windows Server 2008 for x64-based Systems Service Pack 2 4481486 (Monthly Rollup) 4481487 (Security Only) Important Information Disclosure 4471990, 3142037 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems | 4480961 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems | 4480961 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 | 4480961 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation) | 4480961 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.6/4.6.1/4.6.2 on Windows 10 for 32-bit Systems | 4480962 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.6/4.6.1/4.6.2 on Windows 10 for x64-based Systems | 4480962 (Security Update) |
Important | Information Disclosure | Yes |
| 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 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142037 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 7 for x64-based Systems Service Pack 1 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142037 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 32-bit systems 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4471989 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 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4471989 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 | 4481484 (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 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142037 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 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4481480 (Monthly Rollup) 4481481 (Security Only) Important Information Disclosure 4471987, 3142037 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 4481482 (Monthly Rollup) 4481483 (Security Only) Important Information Disclosure 4471988 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) 4481482 (Monthly Rollup) 4481483 (Security Only) Important Information Disclosure 4471988 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 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4471989 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) 4481484 (Monthly Rollup) 4481485 (Security Only) Important Information Disclosure 4471989 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft .NET Framework 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems | 4480978 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7.1/4.7.2 on Windows 10 Version 1709 for ARM64-based Systems | 4480978 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems | 4480978 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7.1/4.7.2 on Windows Server, version 1709 (Server Core Installation) | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for 32-bit Systems | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for ARM64-based Systems | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for x64-based Systems | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7.2 on Windows 10 Version 1809 for 32-bit Systems | 4480056 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.7.2 on Windows 10 Version 1809 for x64-based Systems | 4480056 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.7.2 on Windows Server 2019 | 4480056 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.7.2 on Windows Server 2019 (Server Core installation) | 4480056 (Monthly Rollup) |
Important | Information Disclosure | Maybe |
| Microsoft .NET Framework 4.7.2 on Windows Server, version 1803 (Server Core Installation) | 4480966 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7/4.7.1/4.7.2 on Windows 10 Version 1703 for 32-bit Systems | 4480973 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft .NET Framework 4.7/4.7.1/4.7.2 on Windows 10 Version 1703 for x64-based Systems | 4480973 (Security Update) |
Important | Information Disclosure | Yes |
| PowerShell Core 6.1 | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| PowerShell Core 6.2 | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Maybe |
4480962 |
Security Update | Yes |
4480961 |
Security Update | Yes |
4480973 |
Security Update | Yes |
4480978 |
Security Update | Yes |
4480966 |
Security Update | Yes |
4480056 |
Monthly Rollup | Maybe |
4481484 |
Monthly Rollup | 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
None
References
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