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 CVSS 3.1 base score is 8.8 (high), and the attacker needs a valid low-privilege login (PR:L). The official CVE record lists affected SQL Server 2025 builds, but the NVD analysis is pending and the fixed builds for this CVE are not confirmed.
Affected
- Microsoft SQL Server 2025 CU10: 17.0.4006.0 to < 17.0.5045.3
- Microsoft SQL Server 2025 for x64-based Systems (GDR): 17.0.1050.2 to < 17.0.1155.3
Fixed in
Unknown. Not confirmed for CVE-2026-67372. Check the MSRC advisory for the fixed builds.
Workaround
Unknown. No vendor mitigation was found for this CVE.
Exploitation
Unknown. No KEV listing or public proof-of-concept was found for this CVE.
Our recommendation
- Open the MSRC advisory and record the affected products and fixed builds.
- Inventory all SQL Server instances, including version, build and network reachability.
- Restrict access to the SQL Server port and management interfaces to the application servers that need it. Do not expose SQL Server to the internet.
- Apply the vendor's September 2026 update for each instance's branch once it is confirmed to cover this CVE.
- Monitor for unusual logins and processes on database servers until patched.
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-2026-67372 msrc.microsoft.com
- Microsoft KB5122770: SQL Server 2025 GDR, September 2026 (related batch, not confirmed for this CVE) support.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, 21:04.
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.
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