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CVE-2017-0247

Published: May 12, 2017Updated: May 13, 2026 Sources: CVE List NVD GHSACWE-20
NVD MITRE
7.5CVSSHIGH
EPSS Score
16.9%
Top 3.3%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-20

Affected Products

ASP.NET CoreMicrosoft Corporation
LibraryLibrary
OSS Libraries / generic-library
asp.net model view controllermicrosoft
On-premLibrary
OSS Libraries / web-framework
microsoft.aspnetcore.mvc.abstractionsmicrosoft
On-prem
Operating Systems / windows
microsoft.aspnetcore.mvc.apiexplorermicrosoft
On-prem
Operating Systems / windows
microsoft.aspnetcore.mvc.corsmicrosoft
On-prem
Operating Systems / windows
microsoft corporationcommercialUSOperating Systemsaka microsoft
microsoftcommercialUSOperating Systems
and 33 more affected products View all →

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
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References

https://technet.microsoft.com/en-us/library/security/4021279.aspx
technet.microsoft.com
https://github.com/aspnet/Announcements/issues/239
github.com
https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS
sidertia.com
and 2 more references View all →

Timeline

Published
May 12, 2017
Last Updated
May 13, 2026

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