Is there a public exploit for CVE-2021-1636?

Yes. Proof-of-concept code for CVE-2021-1636 has been published publicly.

Is there a proof of concept for CVE-2021-1636?

Yes — 1 proof-of-concept entry is linked on this page, from public repositories and community submissions. They are listed for authorised testing only.

How severe is CVE-2021-1636?

CVE-2021-1636 scores CVSS 8.8 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 6.69%.

What does CVE-2021-1636 affect?

CVE-2021-1636 affects Microsoft Microsoft SQL Server 2016 for x64-based Systems Service Pack 2 (GDR), Microsoft SQL Server 2014 Service Pack 3 (CU 4), Microsoft SQL Server 2016 Service Pack 2 (CU 15), Microsoft SQL Server 2012 Service Pack 4 (QFE), Microsoft SQL Server 2014 Service Pack 3 (GDR), Microsoft SQL Server 2019 (GDR).

8.8 High

Microsoft SQL Elevation of Privilege Vulnerability

CVE-2021-1636

Proof-of-concept code is published

Public PoC

Public PoCNate0634034090/bug-free-memory36 stars

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 8.8 (v3.1)
Severity: High
EPSS: 6.69% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 12 January 2021
Last updated: 2 November 2026
Affected: Microsoft · Microsoft SQL Server 2012 Service Pack 4 (QFE) · Microsoft SQL Server 2012 for x64-based Systems Service Pack 4 (QFE) · Microsoft SQL Server 2014 Service Pack 3 (CU 4) · Microsoft SQL Server 2014 Service Pack 3 (GDR)
Assigner: microsoft

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

At the source

EUVD (ENISA)

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1636

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

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Query this programmatically

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curl https://cve.zerocrew.in/api/cve/CVE-2021-1636