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Vulnerability record · CVE-2017-0247 · published 12 May 2017

CVE-2017-0247: Microsoft asp.net model view controller improper input validation vulnerability

Microsoft · Asp.Net Model View Controller

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.

7.5 CVSS 3.0 High EPSS 17% · top 3.0% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
18Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by 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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

18 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2018-8171Microsoft asp.net core improper authentication vulnerabilityA Security Feature Bypass vulnerability exists in ASP.NET when the number of incorrect login attempts is not validated, aka "ASP.NET Security Feature…EPSS 10%7.3CVE-2017-0249Microsoft asp.net model view controller improper input validation vulnerabilityAn elevation of privilege vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.EPSS 4.2%5.3CVE-2017-0256Microsoft asp.net model view controller improper input validation vulnerabilityA spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.EPSS 3.5%4.3CVE-2014-4075Microsoft asp.net model view controller cross-site scripting vulnerabilityCross-site scripting (XSS) vulnerability in System.Web.Mvc.dll in Microsoft ASP.NET Model View Controller (MVC) 2.0 through 5.1 allows remote attacke…EPSS 20%9.5CVE-2026-93952Arista velocloud orchestrator improper input validation vulnerabilityVeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access privileged internal functionality an…KEVEPSS 0.90%8.8CVE-2019-1068Microsoft SQL Server improper input validation remote code executionMicrosoft SQL Server mishandles processing of internal functions, allowing an authenticated remote attacker to execute code on the database server. T…KEVEPSS 58%analysed5.9CVE-2025-68686FortiOS symbolic link patch bypass exposes sensitive informationFortiOS contains an information exposure flaw (CWE-200) that lets a remote unauthenticated attacker bypass the patch for the symbolic link persistenc…KEVEPSS 30%analysed9.3CVE-2026-12569PTC Windchill PDMlink and FlexPLM deserialization RCEPTC Windchill PDMlink and FlexPLM contain a deserialization of untrusted data flaw (also classified as improper input validation) that allows remote …KEVEPSS 46%analysed

Source: NIST National Vulnerability Database (record CVE-2017-0247), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.