---
id: CVE-2020-1113
title: >-
  A security feature bypass vulnerability exists in Microsoft Windows when the
  Task Scheduler service fails to properly verify client connections over RPC
summary: >-
  A security feature bypass vulnerability exists in Microsoft Windows when the
  Task Scheduler service fails to properly verify client connections over RPC.
  An attacker who successfully exploited this vulnerability could run arbitrary
  code …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-295
vendor: microsoft
product: windows_10
affected:
  - windows_10
  - windows_10 = 1607
  - windows_10 = 1709
  - windows_10 = 1803
  - windows_10 = 1809
  - windows_10 = 1903
  - windows_10 = 1909
  - windows_7
  - windows_8.1
  - windows_rt_8.1
  - windows_server_2008
  - windows_server_2012
  - windows_server_2012 = r2
  - windows_server_2016
  - windows_server_2019
  - windows_server_2019 = 1903
  - windows_server_2019 = 1909
published: '2020-05-21'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-1113'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1113'
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1113
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.06111
epssPercentile: 0.93164
ingestedAt: '2026-08-19T17:42:38.432Z'
---

## Overview

A security feature bypass vulnerability exists in Microsoft Windows when the Task Scheduler service fails to properly verify client connections over RPC. An attacker who successfully exploited this vulnerability could run arbitrary code as an administrator. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To exploit this vulnerability, a man-in-the-middle attacker would need to send a specially crafted request to a vulnerable system.
The security update addresses the vulnerability by correcting how the Task Scheduler service validates connections.

## Affected

- `windows_10`
- `windows_10 = 1607`
- `windows_10 = 1709`
- `windows_10 = 1803`
- `windows_10 = 1809`
- `windows_10 = 1903`
- `windows_10 = 1909`
- `windows_7`
- `windows_8.1`
- `windows_rt_8.1`
- `windows_server_2008`
- `windows_server_2012`
- `windows_server_2012 = r2`
- `windows_server_2016`
- `windows_server_2019`
- `windows_server_2019 = 1903`
- `windows_server_2019 = 1909`

## Remediation

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