CVE-2017-0247

mediumpriority · track · 36EPSS 0.169 · 97 %ileEUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

16.9% (97th) EPSS

CVSS 5 · medium

Is it mine?

140 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · OSV

v3.06.9mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

affected products (140)

Products and version ranges known to be affected.

Microsoft Corporation ASP.NET Core≤ ASP.NET Coreenisa_euvdEU
microsoft asp.net model view controller= 1.0.0nvdUScpe:2.3:a:microsoft:asp.net_model_view_controller:*:*:*:*:*:*:*:*
microsoft asp.net model view controller= 1.0.1nvdUScpe:2.3:a:microsoft:asp.net_model_view_controller:*:*:*:*:*:*:*:*
microsoft asp.net model view controller= 1.0.2nvdUScpe:2.3:a:microsoft:asp.net_model_view_controller:*:*:*:*:*:*:*:*
microsoft asp.net model view controller= 1.0.3nvdUScpe:2.3:a:microsoft:asp.net_model_view_controller:*:*:*:*:*:*:*:*
microsoft asp.net model view controller= 1.1.0nvdUScpe:2.3:a:microsoft:asp.net_model_view_controller:*:*:*:*:*:*:*:*
microsoft asp.net model view controller= 1.1.1nvdUScpe:2.3:a:microsoft:asp.net_model_view_controller:*:*:*:*:*:*:*:*
microsoft asp.net model view controller= 1.1.2nvdUScpe:2.3:a:microsoft:asp.net_model_view_controller:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.abstractions= 1.0.0nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.abstractions:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.abstractions= 1.0.1nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.abstractions:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.abstractions= 1.0.2nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.abstractions:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.abstractions= 1.0.3nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.abstractions:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.abstractions= 1.1.0nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.abstractions:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.abstractions= 1.1.1nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.abstractions:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.abstractions= 1.1.2nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.abstractions:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.apiexplorer= 1.0.0nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.apiexplorer:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.apiexplorer= 1.0.1nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.apiexplorer:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.apiexplorer= 1.0.2nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.apiexplorer:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.apiexplorer= 1.0.3nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.apiexplorer:*:*:*:*:*:*:*:*
microsoft microsoft.aspnetcore.mvc.apiexplorer= 1.1.0nvdUScpe:2.3:a:microsoft:microsoft.aspnetcore.mvc.apiexplorer:*:*:*:*:*:*:*:*

showing 20 of 140

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-6xh7-4v2w-36q6ASP.NET Core fails to properly validate web requests2018-10-16ghsa · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2017-05-12modified 2026-06-17

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+25171 more

references (9)

External citations — patches, advisories, analysis.

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