---
id: CVE-2021-1636
title: Microsoft SQL Elevation of Privilege Vulnerability
summary: Microsoft SQL Elevation of Privilege Vulnerability
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
vendor: Microsoft
product: Microsoft SQL Server 2012 Service Pack 4 (QFE)
affected:
  - sql_server_2012_service_pack_4_qfe >= 11.0.0 < publication
  - >-
    sql_server_2012_for_x64-based_systems_service_pack_4_qfe >= 11.0.0 <
    publication
  - sql_server_2017_gdr >= 14.0.0 < publication
  - sql_server_2014_service_pack_3_gdr >= 12.0.0 < publication
  - >-
    sql_server_2016_for_x64-based_systems_service_pack_2_gdr >= 13.0.0 <
    publication
  - sql_server_2014_service_pack_3_cu_4 >= 12.0.0 < publication
  - sql_server_2017_cu_22 >= 14.0.0 < publication
  - sql_server_2016_service_pack_2_cu_15 >= 13.0.0 < publication
  - sql_server_2019_cu_8 >= 16.0.0 < publication
  - sql_server_2019_gdr >= 15.0.0 < publication
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-11-02T17:58:38.273449Z'
exploitAvailable: true
published: '2021-01-12'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T17:58:49.530Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2021-1636'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1636'
    label: Microsoft SQL Elevation of Privilege Vulnerability
tags:
  - cve.org
  - exploit-available
epss: 0.06693
epssPercentile: 0.93931
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/Nate0634034090/bug-free-memory'
  checkedAt: '2026-11-05T19:31:18.368Z'
ingestedAt: '2026-11-05T19:30:42.761Z'
---

## Overview

Microsoft SQL Elevation of Privilege Vulnerability

## Affected

- `sql_server_2012_service_pack_4_qfe >= 11.0.0 < publication`
- `sql_server_2012_for_x64-based_systems_service_pack_4_qfe >= 11.0.0 < publication`
- `sql_server_2017_gdr >= 14.0.0 < publication`
- `sql_server_2014_service_pack_3_gdr >= 12.0.0 < publication`
- `sql_server_2016_for_x64-based_systems_service_pack_2_gdr >= 13.0.0 < publication`
- `sql_server_2014_service_pack_3_cu_4 >= 12.0.0 < publication`
- `sql_server_2017_cu_22 >= 14.0.0 < publication`
- `sql_server_2016_service_pack_2_cu_15 >= 13.0.0 < publication`
- `sql_server_2019_cu_8 >= 16.0.0 < publication`
- `sql_server_2019_gdr >= 15.0.0 < publication`

## Remediation

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