5.5
MEDIUM
CVSS 3.1
CVE-2020-1476
ASP.NET and .NET Elevation of Privilege Vulnerability
Overview
Description
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.
Details
INFO
Published Date :
Aug. 17, 2020, 7:15 p.m.
Last Modified :
June 17, 2026, 3:01 a.m.
Remotely Exploit :
No
Source :
[email protected]
Impact
Affected Products
The following products are affected by CVE-2020-1476
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | LOW | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
This vulnerability allows for an elevation of privilege via ASP.NET and .NET web applications.
- Apply the appropriate .NET Framework cumulative update or security-only update for your system.
- Reboot the system if prompted.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-1476.
| URL | Resource |
|---|---|
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1476 | Patch Vendor Advisory |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1476 | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-1476 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-1476
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-1476 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-1476 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:microsoft:.net:4.8:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 4.8', 'versions': [{'status': 'affected', 'version': '4.8.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows 10 Version 1607 for 32-bit Systems', 'Windows 10 Version 1709 for 32-bit Systems', 'Windows 10 Version 1803 for 32-bit Systems', 'Windows 10 Version 1803 for x64-based Systems', 'Windows 10 Version 1709 for x64-based Systems', 'Windows 8.1 for x64-based systems', 'Windows 8.1 for 32-bit systems', 'Windows 7 for 32-bit Systems Service Pack 1', 'Windows Server 2016 (Server Core installation)', 'Windows 10 Version 1607 for x64-based Systems', 'Windows Server 2016', 'Windows Server 2012 R2 (Server Core installation)', 'Windows 7 for x64-based Systems Service Pack 1', 'Windows Server 2012 R2', 'Windows Server 2012', 'Windows Server 2012 (Server Core installation)', 'Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)', 'Windows Server 2008 R2 for x64-based Systems Service Pack 1', 'Windows RT 8.1']}, {'cpes': ['cpe:2.3:a:microsoft:.net:4.8:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 3.5 AND 4.8', 'versions': [{'status': 'affected', 'version': '4.8.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows 10 Version 1909 for 32-bit Systems', 'Windows Server 2019', 'Windows 10 Version 1809 for 32-bit Systems', 'Windows Server 2019 (Server Core installation)', 'Windows 10 Version 1809 for x64-based Systems', 'Windows 10 Version 1903 for ARM64-based Systems', 'Windows 10 Version 1909 for x64-based Systems', 'Windows 10 Version 1903 for 32-bit Systems', 'Windows 10 Version 1909 for ARM64-based Systems', 'Windows 10 Version 2004 for ARM64-based Systems', 'Windows Server, version 1909 (Server Core installation)', 'Windows Server, version 1903 (Server Core installation)', 'Windows 10 Version 1903 for x64-based Systems', 'Windows Server, version 2004 (Server Core installation)', 'Windows 10 Version 2004 for x64-based Systems', 'Windows 10 Version 2004 for 32-bit Systems']}, {'cpes': ['cpe:2.3:a:microsoft:.net:2.0:sp2:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 2.0 Service Pack 2', 'versions': [{'status': 'affected', 'version': '2.0.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows Server 2008 for 32-bit Systems Service Pack 2', 'Windows Server 2008 for x64-based Systems Service Pack 2']}, {'cpes': ['cpe:2.3:a:microsoft:.net_framework:4.5.2:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 4.5.2', 'versions': [{'status': 'affected', 'version': '4.0.0.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows Server 2012 R2 (Server Core installation)', 'Windows Server 2008 R2 for x64-based Systems Service Pack 1', 'Windows 8.1 for 32-bit systems', 'Windows 7 for x64-based Systems Service Pack 1', 'Windows 7 for 32-bit Systems Service Pack 1', 'Windows Server 2012 R2', 'Windows Server 2012', 'Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)', 'Windows RT 8.1', 'Windows Server 2008 for x64-based Systems Service Pack 2', 'Windows Server 2008 for 32-bit Systems Service Pack 2', 'Windows 8.1 for x64-based systems', 'Windows Server 2012 (Server Core installation)']}, {'cpes': ['cpe:2.3:a:microsoft:.net_framework:4.6:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2', 'versions': [{'status': 'affected', 'version': '4.0.0.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows RT 8.1', 'Windows Server 2012 R2', 'Windows Server 2012 R2 (Server Core installation)', 'Windows Server 2008 R2 for x64-based Systems Service Pack 1', 'Windows Server 2012', 'Windows Server 2012 (Server Core installation)', 'Windows 7 for x64-based Systems Service Pack 1', 'Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)', 'Windows 8.1 for x64-based systems', 'Windows 7 for 32-bit Systems Service Pack 1', 'Windows 8.1 for 32-bit systems']}, {'cpes': ['cpe:2.3:a:microsoft:.net:4.7.2:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 3.5 AND 4.7.2', 'versions': [{'status': 'affected', 'version': '4.7.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows 10 Version 1803 for ARM64-based Systems', 'Windows 10 Version 1803 for x64-based Systems', 'Windows 10 Version 1809 for ARM64-based Systems', 'Windows Server 2019 (Server Core installation)', 'Windows 10 Version 1803 for 32-bit Systems', 'Windows 10 Version 1809 for 32-bit Systems', 'Windows 10 Version 1809 for x64-based Systems', 'Windows Server 2019']}, {'cpes': ['cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2', 'versions': [{'status': 'affected', 'version': '3.0.0.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows 10 Version 1607 for x64-based Systems', 'Windows 10 Version 1607 for 32-bit Systems', 'Windows Server 2016', 'Windows Server 2016 (Server Core installation)']}, {'cpes': ['cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2', 'versions': [{'status': 'affected', 'version': '3.5.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows 10 for 32-bit Systems', 'Windows 10 for x64-based Systems']}, {'cpes': ['cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2', 'versions': [{'status': 'affected', 'version': '3.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows 10 Version 1709 for 32-bit Systems', 'Windows 10 Version 1709 for x64-based Systems', 'Windows 10 Version 1709 for ARM64-based Systems']}, {'cpes': ['cpe:2.3:a:microsoft:.net_framework:4.6:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 4.6', 'versions': [{'status': 'affected', 'version': '4.0.0.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows Server 2008 for 32-bit Systems Service Pack 2', 'Windows Server 2008 for x64-based Systems Service Pack 2']}, {'cpes': ['cpe:2.3:a:microsoft:.net:3.5:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 3.5', 'versions': [{'status': 'affected', 'version': '3.5.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows 8.1 for x64-based systems', 'Windows Server 2012', 'Windows Server 2012 (Server Core installation)', 'Windows 8.1 for 32-bit systems', 'Windows Server 2012 R2 (Server Core installation)', 'Windows Server 2012 R2']}, {'cpes': ['cpe:2.3:a:microsoft:.net:3.5.1:*:*:*:*:*:*:*'], 'vendor': 'Microsoft', 'product': 'Microsoft .NET Framework 3.5.1', 'versions': [{'status': 'affected', 'version': '3.5.0', 'lessThan': 'publication', 'versionType': 'custom'}], 'platforms': ['Windows Server 2008 R2 for x64-based Systems Service Pack 1', 'Windows 7 for x64-based Systems Service Pack 1', 'Windows 7 for 32-bit Systems Service Pack 1']}] -
CVE Modified by [email protected]
Feb. 23, 2026
Action Type Old Value New Value Changed Description 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. 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. -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1476 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Jan. 19, 2024
Action Type Old Value New Value Changed Description <p>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.</p> <p>To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server.</p> <p>The update addresses the vulnerability by changing how ASP.NET and .NET handle requests.</p> 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. -
CVE Modified by [email protected]
Jan. 04, 2024
Action Type Old Value New Value Changed Description An elevation of privilege vulnerability exists when ASP.NET or .NET web applications running on IIS improperly allow access to cached files, aka 'ASP.NET and .NET Elevation of Privilege Vulnerability'. <p>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.</p> <p>To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server.</p> <p>The update addresses the vulnerability by changing how ASP.NET and .NET handle requests.</p> -
CWE Remap by [email protected]
Jul. 21, 2021
Action Type Old Value New Value Changed CWE CWE-269 NVD-CWE-noinfo -
Initial Analysis by [email protected]
Aug. 24, 2020
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Changed Reference Type https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1476 No Types Assigned https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1476 Patch, Vendor Advisory Added CWE NIST CWE-269 Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:2.0:sp2:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.6:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.6.1:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:3.5.1:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_7:sp1:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2008:r2:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:4.5.2:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:4.6:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:4.6:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.6.1:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:* OR cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.