CVE-2021-1636 — Microsoft SQL Elevation of Privilege Vulnerability

Executive Summary

None

Overview

8.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Elevation of Privilege

Released Jan 12 2021

Last Updated Jan 12 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.06153 — 0.92828 percentile

NVD CVSS 8.8 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.7

EPSS Score

0.06153

probability of exploitation in the next 30 days

0.92828 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

12 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft SQL Server 2012 for 32-bit Systems Service Pack 4 (QFE)	`4583465 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2012 for x64-based Systems Service Pack 4 (QFE)	`4583465 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2014 Service Pack 3 for 32-bit Systems (CU 4)	`4583462 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2014 Service Pack 3 for 32-bit Systems (GDR)	`4583463 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2014 Service Pack 3 for x64-based Systems (CU 4)	`4583462 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2014 Service Pack 3 for x64-based Systems (GDR)	`4583463 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2016 for x64-based Systems Service Pack 2 (GDR)	`4583460 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2016 Service Pack 2 for x64-based Systems (CU 15)	`4583461 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2017 for x64-based Systems (CU 22)	`4583457 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2017 for x64-based Systems (GDR)	`4583456 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2019 for x64-based Systems (CU 8)	`4583459 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft SQL Server 2019 for x64-based Systems (GDR)	`4583458 (Security Update)`	Important	Elevation of Privilege	Maybe

Patches

9 patches

Article	Type	Restart
`4583465`	Security Update	Maybe
`4583462`	Security Update	Maybe
`4583463`	Security Update	Maybe
`4583460`	Security Update	Maybe
`4583461`	Security Update	Maybe
`4583457`	Security Update	Maybe
`4583456`	Security Update	Maybe
`4583459`	Security Update	Maybe
`4583458`	Security Update	Maybe

Exploits & PoC

1 public PoC

Unverified third-party code

Public proof-of-concept repositories aggregated from PoC-in-GitHub. They are not reviewed and may be incomplete, non-functional, or malicious — inspect the code before running anything.

Repository	Stars	Published	Description
Nate0634034090/bug-free-memory	34	2022-03-04	![logo](https://github.com/curated-intel/Ukraine-Cyber-Operations/blob/main/ci-logo.png) # Ukraine-Cyber-Operations Curated Intelligence is working with analysts from around the world to

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

None

References

MSRC Advisory MITRE NVD