---
id: CVE-2020-1111
title: >-
  An elevation of privilege vulnerability exists when Windows improperly handles
  calls to Clipboard Service
summary: >-
  An elevation of privilege vulnerability exists when Windows improperly handles
  calls to Clipboard Service. An attacker who successfully exploited this
  vulnerability could run arbitrary code in the security context of the local
  system. An…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: microsoft
product: windows_10
affected:
  - windows_10 = 1809
  - windows_10 = 1903
  - windows_10 = 1909
  - 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-2020-1111'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1111'
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1111
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00944
epssPercentile: 0.59553
ingestedAt: '2026-08-19T17:42:38.359Z'
---

## Overview

An elevation of privilege vulnerability exists when Windows improperly handles calls to Clipboard Service. An attacker who successfully exploited this vulnerability could run arbitrary code in the security context of the local system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control over an affected system.
The update addresses the vulnerability by correcting how Windows handles calls to Clipboard Service.

## Affected

- `windows_10 = 1809`
- `windows_10 = 1903`
- `windows_10 = 1909`
- `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.