CVE-2017-0247

high-risk
Published 2017-05-12

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.

Do I need to act?

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11.1% chance of exploitation in next 30 days
EPSS score — higher than 89% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Microsoft

References (6)

Technical Description https://github.com/aspnet/Announcements/issues/239
Patch https://technet.microsoft.com/en-us/library/security/4021279.aspx
Exploit https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-...
Technical Description https://github.com/aspnet/Announcements/issues/239
Patch https://technet.microsoft.com/en-us/library/security/4021279.aspx
Exploit https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-...
67
/ 100
high-risk
Severity 26/34 · High
Exploitability 11/34 · Low
Exposure 30/34 · Critical