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CVE-2017-0247

31
FAUCET Score

CVE-2017-0247 describes a denial of service vulnerability in ASP.NET Core, specifically affecting versions prior to 1.0.4 and 1.1.x before 1.1.3. The issue stems from improper validation of web requests, potentially related to how the TextEncoder.EncodeCore function handles 4-byte Unicode characters. With a CVSS score of 7.5 (HIGH), this vulnerability can be exploited remotely with low attack complexity, leading to a denial of service without requiring user interaction. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.0CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_model_view_controller:1.0.0:*:*:*:*:*:*:*
1.0.1CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_model_view_controller:1.0.1:*:*:*:*:*:*:*
1.0.2CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_model_view_controller:1.0.2:*:*:*:*:*:*:*
1.0.3CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_model_view_controller:1.0.3:*:*:*:*:*:*:*
1.1.0CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_model_view_controller:1.1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
16.91%
Probability of exploitation in next 30 days
EPSS Percentile
96.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1691 is in the 95th percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (38)

nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.MvcFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.MvcFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.CoreFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.CoreFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: System.Net.HttpFixed in: 4.1.2
nugetpatch availablevia ghsa
Product: System.Net.HttpFixed in: 4.3.2
nugetpatch availablevia ghsa
Product: System.Text.Encodings.WebFixed in: 4.0.1
nugetpatch availablevia ghsa
Product: System.Text.Encodings.WebFixed in: 4.3.1
nugetpatch availablevia ghsa
Product: System.Net.Http.WinHttpHandlerFixed in: 4.0.1
nugetpatch availablevia ghsa
Product: System.Net.SecurityFixed in: 4.0.1
nugetpatch availablevia ghsa
Product: System.Net.SecurityFixed in: 4.3.1
nugetpatch availablevia ghsa
Product: System.Net.WebSockets.ClientFixed in: 4.0.1
nugetpatch availablevia ghsa
Product: System.Net.WebSockets.ClientFixed in: 4.3.1
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.AbstractionsFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.AbstractionsFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.ApiExplorerFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.ApiExplorerFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.CorsFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.CorsFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.DataAnnotationsFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.DataAnnotationsFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.Formatters.JsonFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.Formatters.JsonFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.Formatters.XmlFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.Formatters.XmlFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.LocalizationFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.LocalizationFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.Razor.HostFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.Razor.HostFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.RazorFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.RazorFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.TagHelpersFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.TagHelpersFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.ViewFeaturesFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.ViewFeaturesFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.WebApiCompatShimFixed in: 1.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.Mvc.WebApiCompatShimFixed in: 1.1.3
nugetpatch availablevia ghsa
Product: System.Net.Http.WinHttpHandlerFixed in: 4.5.4

Vendor Advisories (1)

nugetGHSA-6xh7-4v2w-36q6high

ASP.NET Core fails to properly validate web requests

Oct 16, 2018

References

github.com / aspnet/Announcements/issues/239
Technical DescriptionThird Party Advisory
technet.microsoft.com / en-us/library/security/4021279.aspx
PatchVendor Advisory
sidertia.com / Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS
ExploitThird Party Advisory