Microsoft SQL Server: Elevation of privilege via stack-based buffer overflow
Summary
A stack-based buffer overflow (CWE-121) in Microsoft SQL Server 2025 for x64-based systems (GDR) allows an authorized attacker with a low-privilege SQL login to elevate privileges over the network. A successful attack could give the attacker high impact on confidentiality, integrity and availability. The CVSS base score is 8.8 (High). The attacker needs valid credentials, so the risk is mainly from compromised, weak or shared accounts rather than direct internet attacks. The NVD entry was still awaiting analysis at publication.
Affected
- Microsoft SQL Server 2025 for x64-based Systems (GDR): versions 17.0.1050.2 up to, but not including, 17.0.1155.3 (per third-party aggregator data)
- Other SQL Server branches: Unknown.
Fixed in
- Unknown. The fixed build and KB article could not be verified; check the MSRC advisory.
Workaround
- None known.
- Restrict SQL logins to the minimum needed, remove unused accounts and keep database servers off the internet.
Exploitation
- Not listed as known exploited (KEV: No).
- No public proof of concept or exploit found at the time of writing; the record was published on 10 November 2026.
Our recommendation
- Read the MSRC advisory and record the fixed build and KB for each installed SQL Server branch.
- Inventory SQL Server instances and check whether their build numbers fall within the affected range.
- Review accounts with login rights, especially shared service and application accounts, and enforce strong passwords.
- Apply the vendor update in the standard patch cycle once the fixed build is confirmed; prioritise servers with many logins or exposed management interfaces.
- Re-check the CISA KEV catalogue and the MSRC page for updates.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – SQL Server
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- SQL Server
- Updates (KB)
- KB5132748
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Response Center: CVE-2026-67375 msrc.microsoft.com
- StriX: CVE-2026-67375 (aggregator) www.strix.ai
- Microsoft SQL Server 2025 GDR servicing (Microsoft Support) support.microsoft.com
- Zero Day Initiative: The September 2026 Security Update Review www.thezdi.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, 21:05.
Original description (NVD)
Stack-based buffer overflow in SQL Server allows an authorized attacker to elevate privileges 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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