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High, CVSS 7.3

High severity vulnerability that affects Microsoft.AspNetCore.Mvc

CVE-2017-0249GHSA-qhqf-ghgh-x2m4

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • NuGet system.text.encodings.web

    Affected
    >= 4.0.0, <= 4.0.0>= 4.3.0, <= 4.3.0
    Fixed in
    4.3.1, 4.0.1

  • NuGet microsoft.aspnetcore.mvc.core

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet system.net.http.winhttphandler

    Affected
    >= 4.0.0, <= 4.0.0>= 4.3.0, <= 4.3.0
    Fixed in
    4.3.1, 4.0.1

  • NuGet microsoft.aspnetcore.mvc.dataannotations

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc.webapicompatshim

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc.razor

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc.cors

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc.taghelpers

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc.razor.host

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc

    Affected
    >= 1.1.0, < 1.1.3>= 1.0.0, < 1.0.4
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc.abstractions

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc.formatters.json

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet discatsharp

    Affected
    <= 9.8.3
    Fixed in
    no fixed version recorded

  • NuGet microsoft.aspnetcore.mvc.viewfeatures

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet microsoft.aspnetcore.mvc.formatters.xml

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet system.net.http

    Affected
    >= 4.1.1, <= 4.1.1>= 4.3.1, <= 4.3.1
    Fixed in
    4.3.2, 4.1.2

  • NuGet microsoft.aspnetcore.mvc.apiexplorer

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

  • NuGet system.net.websockets.client

    Affected
    >= 4.0.0, <= 4.0.0>= 4.3.0, <= 4.3.0
    Fixed in
    4.3.1, 4.0.1

  • NuGet system.net.security

    Affected
    >= 4.0.0, <= 4.0.0>= 4.3.0, <= 4.3.0
    Fixed in
    4.3.1, 4.0.1

  • NuGet microsoft.aspnetcore.mvc.localization

    Affected
    >= 1.0.0, < 1.0.4>= 1.1.0, < 1.1.3
    Fixed in
    1.0.4, 1.1.3

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-qhqf-ghgh-x2m4 lists affected ranges: NuGet microsoft.aspnetcore.mvc >=1.1.0 =1.0.0 =1.0.0 =1.1.0 =4.1.1 =4.3.1 =4.0.0 =4.3.0 =4.0.0 =4.3.0 =4.0.0 =4.3.0 =4.0.0…

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.3 · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS
  • CVE-2017-0249: 4.25% estimated exploitation activity in the next 30 days; percentile 91.06 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

See https://nvd.nist.gov/vuln/detail/CVE-2017-0249 & https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0249

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-qhqf-ghgh-x2m4

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2017-0249

Advisory: High severity vulnerability that affects Microsoft.AspNetCore.Mvc
IDs: CVE-2017-0249, GHSA-qhqf-ghgh-x2m4
Record: https://patchnext.com/advisories/cve-2017-0249 (revision 1, source checked 26 Oct 2026, 16:59 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: system.text.encodings.web 4.3.1, 4.0.1; microsoft.aspnetcore.mvc.core 1.1.3, 1.0.4; system.net.http.winhttphandler 4.3.1, 4.0.1; microsoft.aspnetcore.mvc.dataannotations 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.webapicompatshim 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.razor 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.cors 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.taghelpers 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.razor.host 1.1.3, 1.0.4; microsoft.aspnetcore.mvc 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.abstractions 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.formatters.json 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.viewfeatures 1.1.3, 1.0.4; microsoft.aspnetcore.mvc.formatters.xml 1.1.3, 1.0.4; system.net.http 4.3.2, 4.1.2; microsoft.aspnetcore.mvc.apiexplorer 1.1.3, 1.0.4; system.net.websockets.client 4.3.1, 4.0.1; system.net.security 4.3.1, 4.0.1; microsoft.aspnetcore.mvc.localization 1.1.3, 1.0.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet system.text.encodings.web: affected >= 4.0.0, <= 4.0.0; >= 4.3.0, <= 4.3.0; fixed in 4.3.1, 4.0.1
- NuGet microsoft.aspnetcore.mvc.core: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet system.net.http.winhttphandler: affected >= 4.0.0, <= 4.0.0; >= 4.3.0, <= 4.3.0; fixed in 4.3.1, 4.0.1
- NuGet microsoft.aspnetcore.mvc.dataannotations: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc.webapicompatshim: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc.razor: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc.cors: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc.taghelpers: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc.razor.host: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc: affected >= 1.1.0, < 1.1.3; >= 1.0.0, < 1.0.4; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc.abstractions: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc.formatters.json: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet discatsharp: affected <= 9.8.3
- NuGet microsoft.aspnetcore.mvc.viewfeatures: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet microsoft.aspnetcore.mvc.formatters.xml: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet system.net.http: affected >= 4.1.1, <= 4.1.1; >= 4.3.1, <= 4.3.1; fixed in 4.3.2, 4.1.2
- NuGet microsoft.aspnetcore.mvc.apiexplorer: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3
- NuGet system.net.websockets.client: affected >= 4.0.0, <= 4.0.0; >= 4.3.0, <= 4.3.0; fixed in 4.3.1, 4.0.1
- NuGet system.net.security: affected >= 4.0.0, <= 4.0.0; >= 4.3.0, <= 4.3.0; fixed in 4.3.1, 4.0.1
- NuGet microsoft.aspnetcore.mvc.localization: affected >= 1.0.0, < 1.0.4; >= 1.1.0, < 1.1.3; fixed in 1.0.4, 1.1.3

## Suggested inspection (read-only)
- NuGet system.text.encodings.web: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.core: check the installed version with your package manager.
- NuGet system.net.http.winhttphandler: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.dataannotations: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.webapicompatshim: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.razor: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.cors: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.taghelpers: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.razor.host: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.abstractions: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.formatters.json: check the installed version with your package manager.
- NuGet discatsharp: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.viewfeatures: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.formatters.xml: check the installed version with your package manager.
- NuGet system.net.http: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.apiexplorer: check the installed version with your package manager.
- NuGet system.net.websockets.client: check the installed version with your package manager.
- NuGet system.net.security: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.mvc.localization: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on system.text.encodings.web, microsoft.aspnetcore.mvc.core, system.net.http.winhttphandler, microsoft.aspnetcore.mvc.dataannotations, microsoft.aspnetcore.mvc.webapicompatshim, microsoft.aspnetcore.mvc.razor, microsoft.aspnetcore.mvc.cors, microsoft.aspnetcore.mvc.taghelpers, microsoft.aspnetcore.mvc.razor.host, microsoft.aspnetcore.mvc, microsoft.aspnetcore.mvc.abstractions, microsoft.aspnetcore.mvc.formatters.json, discatsharp, microsoft.aspnetcore.mvc.viewfeatures, microsoft.aspnetcore.mvc.formatters.xml, system.net.http, microsoft.aspnetcore.mvc.apiexplorer, system.net.websockets.client, system.net.security, microsoft.aspnetcore.mvc.localization.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-qhqf-ghgh-x2m4 (GitHub-reviewed advisory GHSA-qhqf-ghgh-x2m4 lists affected ranges: NuGet microsoft.aspnetcore.mvc >=1.1.0 =1.0.0 =1.0.0 =1.1.0 =4.1.1 =4.3.1 =4.0.0 =4.3.0 =4.0.0 =4.3.0 =4.0.0 =4.3.0 =4.0.0…)

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