Home/CVE/A spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.
CVE

CVE-2017-0256

A spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.

A spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.

MEDIUM · CVSS 5.3 EPSS 0.04349
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
▤

Affected Products & Versions

9
microsoft asp.net model view controllerall versions
microsoft microsoft.aspnetcore.mvc.abstractionsall versions
microsoft microsoft.aspnetcore.mvc.apiexplorerall versions
microsoft microsoft.aspnetcore.mvc.corsall versions
microsoft microsoft.aspnetcore.mvc.dataannotationsall versions
microsoft microsoft.aspnetcore.mvc.formatters.jsonall versions
microsoft microsoft.aspnetcore.mvc.formatters.xmlall versions
microsoft microsoft.aspnetcore.mvc.localizationall versions
▤

Affected Packages

19
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
NuGet Microsoft.AspNetCore.Mvc MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.Abstractions MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.ApiExplorer MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.Core MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.Cors MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.DataAnnotations MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.Formatters.Json MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.Formatters.Xml MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.Localization MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.Razor MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.Razor.Host MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.TagHelpers MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.ViewFeatures MODERATE fixed in 1.0.4
NuGet Microsoft.AspNetCore.Mvc.WebApiCompatShim MODERATE fixed in 1.0.4
NuGet System.Net.Http MODERATE fixed in 4.1.2
NuGet System.Net.Http.WinHttpHandler MODERATE fixed in 4.0.1
NuGet System.Net.Security MODERATE fixed in 4.0.1
NuGet System.Net.WebSockets.Client MODERATE fixed in 4.0.1
NuGet System.Text.Encodings.Web MODERATE fixed in 4.0.1
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.0 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 May 2017 · 02:29 PM
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/aspnet/Announcements/issues/239Technical DescriptionThird Party Advisory
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