CVSS 3.0
7.5 highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NCVE-2017-0247
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
- EPSS
- 17% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-31)
- CWE
- CWE-20
- Published
- Modified
- Record from
- the NVD, synced
Affected
- microsoft:asp.net_model_view_controller
- microsoft:microsoft.aspnetcore.mvc.abstractions
- microsoft:microsoft.aspnetcore.mvc.apiexplorer
- microsoft:microsoft.aspnetcore.mvc.cors
- microsoft:microsoft.aspnetcore.mvc.dataannotations
- microsoft:microsoft.aspnetcore.mvc.formatters.json
- microsoft:microsoft.aspnetcore.mvc.formatters.xml
- microsoft:microsoft.aspnetcore.mvc.localization
- microsoft:microsoft.aspnetcore.mvc.razor
- microsoft:microsoft.aspnetcore.mvc.razor.host
- microsoft:microsoft.aspnetcore.mvc.taghelpers
- microsoft:microsoft.aspnetcore.mvc.viewfeatures
- microsoft:microsoft.aspnetcore.mvc.webapicompatshim
- microsoft:system.net.http
- microsoft:system.net.http.winhttphandler
- microsoft:system.net.security
- microsoft:system.net.websockets.client
- microsoft:system.text.encodings.web
References
- https://github.com/aspnet/Announcements/issues/239
- https://technet.microsoft.com/en-us/library/security/4021279.aspx
- https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS
- https://github.com/aspnet/Announcements/issues/239
- https://technet.microsoft.com/en-us/library/security/4021279.aspx