CVE-2017-0247: Microsoft.AspNetCore.Mvc ASP.NET Core Fails To Properly Vulnerability

Q: What is CVE-2017-0247?

CVE-2017-0247 is a security vulnerability in Microsoft.AspNetCore.Mvc involving ASP.NET Core fails to properly validate web requests under CWE-20: Improper Input Validation.

Q: Which Microsoft.AspNetCore.Mvc versions are affected?

Affected versions include releases prior to 1.0.4, 1.1.3, 4.1.2, 4.3.2, 4.0.1, 4.3.1, 4.5.4 across affected packages: Microsoft.AspNetCore.Mvc, Microsoft.AspNetCore.Mvc.Core, System.Net.Http, System.Text.Encodings.Web, System.Net.Http.WinHttpHandler, System.Net.Security, System.Net.WebSockets.Client, Microsoft.AspNetCore.Mvc.Abstractions, Microsoft.AspNetCore.Mvc.ApiExplorer, Microsoft.AspNetCore.Mvc.Cors, Microsoft.AspNetCore.Mvc.DataAnnotations, Microsoft.AspNetCore.Mvc.Formatters.Json, Microsoft.AspNetCore.Mvc.Formatters.Xml, Microsoft.AspNetCore.Mvc.Localization, Microsoft.AspNetCore.Mvc.Razor.Host, Microsoft.AspNetCore.Mvc.Razor, Microsoft.AspNetCore.Mvc.TagHelpers, Microsoft.AspNetCore.Mvc.ViewFeatures, Microsoft.AspNetCore.Mvc.WebApiCompatShim.

Q: What version fixes CVE-2017-0247?

Upgrading to 1.0.4, 1.1.3, 4.1.2, 4.3.2, 4.0.1, 4.3.1, 4.5.4 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is Microsoft.AspNetCore.Mvc affected?

Yes, Microsoft.AspNetCore.Mvc is affected in releases prior to 1.0.4, 1.1.3. Upgrade your dependency to 1.0.4, 1.1.3 or later.

Q: Is Microsoft.AspNetCore.Mvc.Core affected?

Yes, Microsoft.AspNetCore.Mvc.Core is affected in releases prior to 1.0.4, 1.1.3. Upgrade your dependency to 1.0.4, 1.1.3 or later.

Q: What is the CVSS score of CVE-2017-0247?

CVE-2017-0247 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Q: What CWE is associated with CVE-2017-0247?

CVE-2017-0247 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).

Q: How can I check NuGet dependencies for CVE-2017-0247?

Run the dependency tree command: 'inspect dependencies for Microsoft.AspNetCore.Mvc'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

HIGH

Advisory Identifier: GHSA-6xh7-4v2w-36q6

CVSS 7.5

CWE-20

Published 2018-10-16

Advisory Summary

CVE-2017-0247 is a HIGH (CVSS 7.5) asp.net core fails to properly vulnerability (CWE-20: Improper Input Validation) affecting Microsoft.AspNetCore.Mvc libraries in the NuGet ecosystem. The issue involves asp.net core fails to properly validate web requests. Remediation is available by upgrading affected packages to version 1.0.4, 1.1.3, 4.1.2, 4.3.2, 4.0.1, 4.3.1, 4.5.4.

CVE-2017-0247 at a Glance

CVE Identifier CVE-2017-0247

GHSA Identifier GHSA-6xh7-4v2w-36q6

Severity HIGH

CVSS v3.1 Base Score 7.5

CWE Classification CWE-20: Improper Input Validation

Affected Product Microsoft.AspNetCore.Mvc

Package Ecosystem NuGet

Published Date 2018-10-16

Last Updated 2022-04-26

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity High (I:H)

Availability None (A:N)

How to Fix CVE-2017-0247

To remediate this vulnerability, upgrade all affected Microsoft.AspNetCore.Mvc dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Microsoft.AspNetCore.Mvc fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc to 1.0.4

Microsoft.AspNetCore.Mvc fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc to 1.1.3

Microsoft.AspNetCore.Mvc.Core fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.Core to 1.0.4

Microsoft.AspNetCore.Mvc.Core fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.Core to 1.1.3

System.Net.Http fixed: 4.1.2

Upgrade System.Net.Http to 4.1.2

System.Net.Http fixed: 4.3.2

Upgrade System.Net.Http to 4.3.2

System.Text.Encodings.Web fixed: 4.0.1

Upgrade System.Text.Encodings.Web to 4.0.1

System.Text.Encodings.Web fixed: 4.3.1

Upgrade System.Text.Encodings.Web to 4.3.1

System.Net.Http.WinHttpHandler fixed: 4.0.1

Upgrade System.Net.Http.WinHttpHandler to 4.0.1

System.Net.Http.WinHttpHandler fixed: 4.5.4

Upgrade System.Net.Http.WinHttpHandler to 4.5.4

System.Net.Security fixed: 4.0.1

Upgrade System.Net.Security to 4.0.1

System.Net.Security fixed: 4.3.1

Upgrade System.Net.Security to 4.3.1

System.Net.WebSockets.Client fixed: 4.0.1

Upgrade System.Net.WebSockets.Client to 4.0.1

System.Net.WebSockets.Client fixed: 4.3.1

Upgrade System.Net.WebSockets.Client to 4.3.1

Microsoft.AspNetCore.Mvc.Abstractions fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.Abstractions to 1.0.4

Microsoft.AspNetCore.Mvc.Abstractions fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.Abstractions to 1.1.3

Microsoft.AspNetCore.Mvc.ApiExplorer fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.ApiExplorer to 1.0.4

Microsoft.AspNetCore.Mvc.ApiExplorer fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.ApiExplorer to 1.1.3

Microsoft.AspNetCore.Mvc.Cors fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.Cors to 1.0.4

Microsoft.AspNetCore.Mvc.Cors fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.Cors to 1.1.3

Microsoft.AspNetCore.Mvc.DataAnnotations fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.DataAnnotations to 1.0.4

Microsoft.AspNetCore.Mvc.DataAnnotations fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.DataAnnotations to 1.1.3

Microsoft.AspNetCore.Mvc.Formatters.Json fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.Formatters.Json to 1.0.4

Microsoft.AspNetCore.Mvc.Formatters.Json fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.Formatters.Json to 1.1.3

Microsoft.AspNetCore.Mvc.Formatters.Xml fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.Formatters.Xml to 1.0.4

Microsoft.AspNetCore.Mvc.Formatters.Xml fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.Formatters.Xml to 1.1.3

Microsoft.AspNetCore.Mvc.Localization fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.Localization to 1.0.4

Microsoft.AspNetCore.Mvc.Localization fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.Localization to 1.1.3

Microsoft.AspNetCore.Mvc.Razor.Host fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.Razor.Host to 1.0.4

Microsoft.AspNetCore.Mvc.Razor.Host fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.Razor.Host to 1.1.3

Microsoft.AspNetCore.Mvc.Razor fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.Razor to 1.0.4

Microsoft.AspNetCore.Mvc.Razor fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.Razor to 1.1.3

Microsoft.AspNetCore.Mvc.TagHelpers fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.TagHelpers to 1.0.4

Microsoft.AspNetCore.Mvc.TagHelpers fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.TagHelpers to 1.1.3

Microsoft.AspNetCore.Mvc.ViewFeatures fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.ViewFeatures to 1.0.4

Microsoft.AspNetCore.Mvc.ViewFeatures fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.ViewFeatures to 1.1.3

Microsoft.AspNetCore.Mvc.WebApiCompatShim fixed: 1.0.4

Upgrade Microsoft.AspNetCore.Mvc.WebApiCompatShim to 1.0.4

Microsoft.AspNetCore.Mvc.WebApiCompatShim fixed: 1.1.3

Upgrade Microsoft.AspNetCore.Mvc.WebApiCompatShim to 1.1.3

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

inspect dependencies for Microsoft.AspNetCore.Mvc

How to Check if You Are Affected

To determine whether your application is affected by CVE-2017-0247, inspect your project dependencies for Microsoft.AspNetCore.Mvc:

inspect dependencies for Microsoft.AspNetCore.Mvc

Analyze the terminal output to locate any version of Microsoft.AspNetCore.Mvc in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Microsoft.AspNetCore.Mvc, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.

CVE-2017-0247 Affected Microsoft.AspNetCore.Mvc Versions

38 component(s)

Fixed Versions:

1.0.41.1.34.1.24.3.24.0.14.3.14.5.4

Product / Package	Ecosystem	Affected Versions	Fixed Version
Microsoft.AspNetCore.Mvc nuget/Microsoft.AspNetCore.Mvc	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc nuget/Microsoft.AspNetCore.Mvc	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.Core nuget/Microsoft.AspNetCore.Mvc.Core	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.Core nuget/Microsoft.AspNetCore.Mvc.Core	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
System.Net.Http nuget/System.Net.Http	NuGet	≥ 4.1.1 < 4.1.2 All 1 versions 4.1.1	4.1.2
System.Net.Http nuget/System.Net.Http	NuGet	≥ 4.3.1 < 4.3.2 All 1 versions 4.3.1	4.3.2
System.Text.Encodings.Web nuget/System.Text.Encodings.Web	NuGet	≥ 4.0.0 < 4.0.1 All 1 versions 4.0.0	4.0.1
System.Text.Encodings.Web nuget/System.Text.Encodings.Web	NuGet	≥ 4.3.0 < 4.3.1 All 1 versions 4.3.0	4.3.1
System.Net.Http.WinHttpHandler nuget/System.Net.Http.WinHttpHandler	NuGet	≥ 4.0.0 < 4.0.1 All 1 versions 4.0.0	4.0.1
System.Net.Http.WinHttpHandler nuget/System.Net.Http.WinHttpHandler	NuGet	≥ 4.3.0 < 4.5.4	4.5.4
System.Net.Security nuget/System.Net.Security	NuGet	≥ 4.0.0 < 4.0.1 All 1 versions 4.0.0	4.0.1
System.Net.Security nuget/System.Net.Security	NuGet	≥ 4.3.0 < 4.3.1 All 1 versions 4.3.0	4.3.1
System.Net.WebSockets.Client nuget/System.Net.WebSockets.Client	NuGet	≥ 4.0.0 < 4.0.1 All 1 versions 4.0.0	4.0.1
System.Net.WebSockets.Client nuget/System.Net.WebSockets.Client	NuGet	≥ 4.3.0 < 4.3.1 All 1 versions 4.3.0	4.3.1
Microsoft.AspNetCore.Mvc.Abstractions nuget/Microsoft.AspNetCore.Mvc.Abstractions	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.Abstractions nuget/Microsoft.AspNetCore.Mvc.Abstractions	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.ApiExplorer nuget/Microsoft.AspNetCore.Mvc.ApiExplorer	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.ApiExplorer nuget/Microsoft.AspNetCore.Mvc.ApiExplorer	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.Cors nuget/Microsoft.AspNetCore.Mvc.Cors	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.Cors nuget/Microsoft.AspNetCore.Mvc.Cors	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.DataAnnotations nuget/Microsoft.AspNetCore.Mvc.DataAnnotations	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.DataAnnotations nuget/Microsoft.AspNetCore.Mvc.DataAnnotations	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.Formatters.Json nuget/Microsoft.AspNetCore.Mvc.Formatters.Json	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.Formatters.Json nuget/Microsoft.AspNetCore.Mvc.Formatters.Json	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.Formatters.Xml nuget/Microsoft.AspNetCore.Mvc.Formatters.Xml	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.Formatters.Xml nuget/Microsoft.AspNetCore.Mvc.Formatters.Xml	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.Localization nuget/Microsoft.AspNetCore.Mvc.Localization	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.Localization nuget/Microsoft.AspNetCore.Mvc.Localization	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.Razor.Host nuget/Microsoft.AspNetCore.Mvc.Razor.Host	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.Razor.Host nuget/Microsoft.AspNetCore.Mvc.Razor.Host	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.Razor nuget/Microsoft.AspNetCore.Mvc.Razor	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.Razor nuget/Microsoft.AspNetCore.Mvc.Razor	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.TagHelpers nuget/Microsoft.AspNetCore.Mvc.TagHelpers	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.TagHelpers nuget/Microsoft.AspNetCore.Mvc.TagHelpers	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.ViewFeatures nuget/Microsoft.AspNetCore.Mvc.ViewFeatures	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.ViewFeatures nuget/Microsoft.AspNetCore.Mvc.ViewFeatures	NuGet	≥ 1.1.0 < 1.1.3	1.1.3
Microsoft.AspNetCore.Mvc.WebApiCompatShim nuget/Microsoft.AspNetCore.Mvc.WebApiCompatShim	NuGet	≥ 1.0.0 < 1.0.4	1.0.4
Microsoft.AspNetCore.Mvc.WebApiCompatShim nuget/Microsoft.AspNetCore.Mvc.WebApiCompatShim	NuGet	≥ 1.1.0 < 1.1.3	1.1.3

References

NVD — CVE-2017-0247 NVD

https://nvd.nist.gov/vuln/detail/CVE-2017-0247

Microsoft.AspNetCore.Mvc Source Repository REPOSITORY

https://github.com/aspnet/Announcements/issues/239

GitHub Advisory / Wiki ADVISORY

https://github.com/advisories/GHSA-6xh7-4v2w-36q6

Microsoft.AspNetCore.Mvc Security Information SECURITY

https://technet.microsoft.com/en-us/library/security/4021279.aspx

www.sidertia.com/home/community/blog... WEB

https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS

Frequently Asked Questions

What is CVE-2017-0247?

CVE-2017-0247 is a security vulnerability in Microsoft.AspNetCore.Mvc involving ASP.NET Core fails to properly validate web requests under CWE-20: Improper Input Validation.

Which Microsoft.AspNetCore.Mvc versions are affected?

Affected versions include releases prior to 1.0.4, 1.1.3, 4.1.2, 4.3.2, 4.0.1, 4.3.1, 4.5.4 across affected packages: Microsoft.AspNetCore.Mvc, Microsoft.AspNetCore.Mvc.Core, System.Net.Http, System.Text.Encodings.Web, System.Net.Http.WinHttpHandler, System.Net.Security, System.Net.WebSockets.Client, Microsoft.AspNetCore.Mvc.Abstractions, Microsoft.AspNetCore.Mvc.ApiExplorer, Microsoft.AspNetCore.Mvc.Cors, Microsoft.AspNetCore.Mvc.DataAnnotations, Microsoft.AspNetCore.Mvc.Formatters.Json, Microsoft.AspNetCore.Mvc.Formatters.Xml, Microsoft.AspNetCore.Mvc.Localization, Microsoft.AspNetCore.Mvc.Razor.Host, Microsoft.AspNetCore.Mvc.Razor, Microsoft.AspNetCore.Mvc.TagHelpers, Microsoft.AspNetCore.Mvc.ViewFeatures, Microsoft.AspNetCore.Mvc.WebApiCompatShim.

What version fixes CVE-2017-0247?

Upgrading to 1.0.4, 1.1.3, 4.1.2, 4.3.2, 4.0.1, 4.3.1, 4.5.4 (or the latest patched release for your respective branch) resolves the vulnerability.

Is Microsoft.AspNetCore.Mvc affected?

Yes, Microsoft.AspNetCore.Mvc is affected in releases prior to 1.0.4, 1.1.3. Upgrade your dependency to 1.0.4, 1.1.3 or later.

Is Microsoft.AspNetCore.Mvc.Core affected?

Yes, Microsoft.AspNetCore.Mvc.Core is affected in releases prior to 1.0.4, 1.1.3. Upgrade your dependency to 1.0.4, 1.1.3 or later.

What is the CVSS score of CVE-2017-0247?

CVE-2017-0247 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

What CWE is associated with CVE-2017-0247?

CVE-2017-0247 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).

How can I check NuGet dependencies for CVE-2017-0247?

Run the dependency tree command: 'inspect dependencies for Microsoft.AspNetCore.Mvc'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6xh7-4v2w-36q6",
  "modified" : "2022-04-26T19:07:08Z",
  "published" : "2018-10-16T19:58:05Z",
  "aliases" : [ "CVE-2017-0247" ],
  "summary" : "ASP.NET Core fails to properly validate web requests",
  "details" : "A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.AspNetCore.Mvc"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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    "versions" : [ "4.3.1" ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
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    "ranges" : [ {
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      "events" : [ {
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    } ],
    "versions" : [ "4.0.0" ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "System.Text.Encodings.Web"
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      "events" : [ {
        "introduced" : "4.3.0"
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    } ],
    "versions" : [ "4.3.0" ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "System.Net.Http.WinHttpHandler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
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    } ],
    "versions" : [ "4.0.0" ]
  }, {
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        "introduced" : "4.3.0"
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  }, {
    "package" : {
      "ecosystem" : "NuGet",
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    },
    "ranges" : [ {
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    "versions" : [ "4.0.0" ]
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    "package" : {
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    "ranges" : [ {
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  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-0247"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aspnet/Announcements/issues/239"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-6xh7-4v2w-36q6"
  }, {
    "type" : "WEB",
    "url" : "https://technet.microsoft.com/en-us/library/security/4021279.aspx"
  }, {
    "type" : "WEB",
    "url" : "https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:20:41Z",
    "nvd_published_at" : "2017-05-12T14:29:00Z"
  }
}

CVSS V3

7.5 HIGH