---
id: CVE-2020-1116
title: >-
  An information disclosure vulnerability exists when the Windows Client Server
  Run-Time Subsystem (CSRSS) fails to properly handle objects in memory
summary: >-
  An information disclosure vulnerability exists when the Windows Client Server
  Run-Time Subsystem (CSRSS) fails to properly handle objects in memory. An
  attacker who successfully exploited the vulnerability could obtain information
  to fur…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
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_2008 = r2
  - windows_server_2012
  - windows_server_2012 = r2
  - windows_server_2016
  - windows_server_2016 = 1803
  - windows_server_2016 = 1903
  - windows_server_2016 = 1909
  - windows_server_2019
published: '2020-05-21'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-1116'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1116'
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1116
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01274
epssPercentile: 0.68663
ingestedAt: '2026-08-19T17:42:38.505Z'
---

## Overview

An information disclosure vulnerability exists when the Windows Client Server Run-Time Subsystem (CSRSS) fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system.
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application.
The update addresses the vulnerability by correcting how the Windows CSRSS handles objects in memory.

## 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_2008 = r2`
- `windows_server_2012`
- `windows_server_2012 = r2`
- `windows_server_2016`
- `windows_server_2016 = 1803`
- `windows_server_2016 = 1903`
- `windows_server_2016 = 1909`
- `windows_server_2019`

## Remediation

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