CVE-2017-0247

7.5 HIGH
Published: May 12, 2017 Modified: May 13, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/aspnet/Announcements/issues/239
Source: secure@microsoft.com
Technical Description Third Party Advisory
https://technet.microsoft.com/en-us/library/security/4021279.aspx
Source: secure@microsoft.com
Patch Vendor Advisory
https://github.com/aspnet/Announcements/issues/239
Source: af854a3a-2127-422b-91ae-364da2661108
Technical Description Third Party Advisory
https://technet.microsoft.com/en-us/library/security/4021279.aspx
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Vendor Advisory
https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit Third Party Advisory

6 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.5 / 10.0
EPSS (Exploit Probability)
16.9%
97th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

microsoft