Microsoft SQL Server: Remote code execution via heap-based buffer overflow
Summary
A heap-based buffer overflow in Microsoft SQL Server allows an authorized attacker to execute code over the network. The official CVE record lists affected SQL Server 2017, 2019, 2022 and 2025 builds, and the CVSS score is 8.8 (High). Exploitation requires a valid login to the database service, so accounts such as application identities, service accounts and administrators are the main concern, not only internet exposure.
Affected
- SQL Server 2017 (GDR): 14.0.0 to before 14.0.2150.2
- SQL Server 2017 for x64-based Systems (CU31): 14.0.3006.16 to before 14.0.3570.2
- SQL Server 2019 (GDR): 15.0.0 to before 15.0.2210.4
- SQL Server 2019 for x64-based Systems (CU32): 15.0.4003.23 to before 15.0.4510.2
- SQL Server 2022 (GDR): 16.0.0 to before 16.0.1220.3
- SQL Server 2022 for x64-based Systems (CU27): 16.0.4003.1 to before 16.0.4315.2
- SQL Server 2025 CU10: 17.0.4006.0 to before 17.0.5045.3
- SQL Server 2025 for x64-based Systems (GDR): 17.0.1050.2 to before 17.0.1155.3
Fixed in
Unknown. The Microsoft advisory was not retrieved; check the MSRC update guide for the fixed builds and KB articles.
Workaround
Unknown.
Exploitation
Unknown. No exploitation in the wild, public proof of concept or CISA KEV listing was found at the time of writing.
Our recommendation
- Open the MSRC advisory and confirm the fixed builds and KB article.
- Inventory all SQL Server instances, their versions and update levels, and the accounts that can log in.
- Patch affected instances as soon as a fix is confirmed.
- Until then, restrict database logins, remove unused accounts and limit service account privileges.
- Re-check NVD and CISA KEV in the coming days, as the record is still awaiting analysis.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-67632 msrc.microsoft.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 10 Nov 2026, 21:01.
Original description (NVD)
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.