CVE-2017-0247
A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented…
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
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.
Timeline
ID reserved
By microsoft
- 8 months later
· 8 months later
Published
- 7 years later
· 7 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 16.9% · top 2.9% of all CVEs (9 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- Denial of Service
- CWE-20 (opens in a new tab)All about CWE-20 and its CVEs
Affected products
Microsoft Corporation · ASP.NET Core
- affected ASP.NET Core
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- NuGetMicrosoft.AspNetCore.MvcGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.AbstractionsGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.ApiExplorerGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.CoreGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.CorsGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.DataAnnotationsGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.Formatters.JsonGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.Formatters.XmlGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.LocalizationGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.RazorGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.Razor.HostGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.TagHelpersGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.ViewFeaturesGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Mvc.WebApiCompatShimGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetSystem.Net.HttpGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetSystem.Net.Http.WinHttpHandlerGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetSystem.Net.SecurityGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetSystem.Net.WebSockets.ClientGHSA-6xh7-4v2w-36q6 (opens in a new tab)
- NuGetSystem.Text.Encodings.WebGHSA-6xh7-4v2w-36q6 (opens in a new tab)
References (3)
- https://technet.microsoft.com/en-us/library/security/4021279.aspx (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/aspnet/Announcements/issues/239 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-6xh7-4v2w-36q6 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2017-0247)Record last updated .