CVE-2017-0247: Improper Input Validation

October 16, 2018 (updated July 1, 2021)

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.

References

github.com/advisories/GHSA-6xh7-4v2w-36q6
github.com/aspnet/Announcements/issues/239
nvd.nist.gov/vuln/detail/CVE-2017-0247

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