---
id: CVE-2020-1108
title: >-
  A denial of service vulnerability exists when .NET Core or .NET Framework
  improperly handles web requests
summary: >-
  A denial of service vulnerability exists when .NET Core or .NET Framework
  improperly handles web requests. An attacker who successfully exploited this
  vulnerability could cause a denial of service against a .NET Core or .NET
  Framework we…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: microsoft
product: .net
affected:
  - .net = 5.0
  - '.net_core >= 2.1, <= 2.1.18'
  - '.net_core >= 3.0, <= 3.1.4'
  - .net_framework = 2.0
  - .net_framework = 3.0
  - .net_framework = 4.6
  - .net_framework = 3.5
  - .net_framework = 4.5.2
  - .net_framework = 4.6.1
  - .net_framework = 4.6.2
  - .net_framework = 4.7
  - .net_framework = 4.7.1
  - .net_framework = 4.7.2
  - .net_framework = 4.8
  - .net_framework = 3.5.1
  - .net_core = 2.1
  - .net_core = 3.1
  - visual_studio_2017 = 15.9
  - visual_studio_2019 = 16.0
  - visual_studio_2019 = 16.4
  - visual_studio_2019 = 16.5
  - powershell = 7.0
  - powershell_core = 6.2
published: '2020-05-21'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-1108'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1108'
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1108
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.06255
epssPercentile: 0.93302
ingestedAt: '2026-08-19T17:42:38.248Z'
---

## Overview

A denial of service vulnerability exists when .NET Core or .NET Framework improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Core or .NET Framework web application. The vulnerability can be exploited remotely, without authentication.
A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET Core or .NET Framework application.
The update addresses the vulnerability by correcting how the .NET Core or .NET Framework web application handles web requests.

## Affected

- `.net = 5.0`
- `.net_core >= 2.1, <= 2.1.18`
- `.net_core >= 3.0, <= 3.1.4`
- `.net_framework = 2.0`
- `.net_framework = 3.0`
- `.net_framework = 4.6`
- `.net_framework = 3.5`
- `.net_framework = 4.5.2`
- `.net_framework = 4.6.1`
- `.net_framework = 4.6.2`
- `.net_framework = 4.7`
- `.net_framework = 4.7.1`
- `.net_framework = 4.7.2`
- `.net_framework = 4.8`
- `.net_framework = 3.5.1`
- `.net_core = 2.1`
- `.net_core = 3.1`
- `visual_studio_2017 = 15.9`
- `visual_studio_2019 = 16.0`
- `visual_studio_2019 = 16.4`
- `visual_studio_2019 = 16.5`
- `powershell = 7.0`
- `powershell_core = 6.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.