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

Status: published. Published: 2021-01-12. Updated: 2026-11-02.

Microsoft SQL Elevation of Privilege Vulnerability

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Microsoft / Microsoft SQL Server 2012 Service Pack 4 (QFE): ≥ 11.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: 32-bit Systems
- Microsoft / Microsoft SQL Server 2012 for x64-based Systems Service Pack 4 (QFE): ≥ 11.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Microsoft SQL Server 2017 (GDR): ≥ 14.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Microsoft SQL Server 2014 Service Pack 3 (GDR): ≥ 12.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems, 32-bit Systems
- Microsoft / Microsoft SQL Server 2016 for x64-based Systems Service Pack 2 (GDR): ≥ 13.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: Unknown
- Microsoft / Microsoft SQL Server 2014 Service Pack 3 (CU 4): ≥ 12.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: 32-bit Systems, x64-based Systems
- Microsoft / Microsoft SQL Server 2017 (CU 22): ≥ 14.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Microsoft SQL Server 2016 Service Pack 2 (CU 15): ≥ 13.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Microsoft SQL Server 2019 (CU 8): ≥ 16.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Microsoft SQL Server 2019 (GDR): ≥ 15.0.0; < publication (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems

## Severity and prioritization

- CVSS 3.1: 8.8 (high); 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; source: CNA: microsoft

- CISA KEV: No listing in collected sources

- EPSS: 6.69% as of 2026-11-02; percentile 93.91%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-89

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1636 (CNA: microsoft; vendor-advisory)

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1636 (ADP: CVE; x_refsource_MISC, x_transferred)

## Provenance

- CNA: microsoft: https://www.cve.org/CVERecord?id=CVE-2021-1636; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2021-1636; retrieved 2026-11-02; source updated Not reported

Revision: 281767c1c336ed5ccd18bba3b60428aff5ff91495dab5088b8df24d0ef38dcf9

Canonical: https://y2.dev/cve/CVE-2021-1636

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.