CVE-2026-67633: CWE-125: Out-of-bounds Read in Microsoft Microsoft SQL Server 2017 (CU 31)
Description
CVE-2026-67633 is an out-of-bounds read vulnerability in Microsoft SQL Server 2017 (CU 31) that allows an authorized attacker to cause a denial of service over a network. The vulnerability affects multiple versions of Microsoft SQL Server 2017, 2019, 2022, and later releases before specific fixed versions. It has a medium severity with a CVSS score of 6.5. An official fix is available from Microsoft.
CVSS v3.1
Score 6.5medium
Affected software
Microsoft
Microsoft SQL Server 2017 (CU 31)
Microsoft
Microsoft SQL Server 2017 (GDR)
Microsoft
Microsoft SQL Server 2019 (CU 32)
Microsoft
Microsoft SQL Server 2019 (GDR)
Microsoft
Microsoft SQL Server 2022 (CU 26)
Microsoft
Microsoft SQL Server 2022 (GDR)
Microsoft
Microsoft SQL Server 2025 (CU8)
Microsoft
Microsoft SQL Server 2025 for x64-based Systems (GDR)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-125) involves an out-of-bounds read in Microsoft SQL Server 2017 and related versions, which can be exploited by an authorized attacker to cause a denial of service condition remotely. The flaw does not impact confidentiality or integrity but affects availability. Multiple version ranges across SQL Server 2017, 2019, 2022, and newer are affected. Microsoft has published an official fix to address this issue.
Potential Impact
An authorized attacker can exploit this vulnerability to cause a denial of service (DoS) over the network, impacting the availability of the Microsoft SQL Server instance. There is no impact on confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67633 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-29T22:49:19.796Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67633","vendor":"Microsoft"}]
Threat ID: 6aa044cdacd9273b49fa7ba2
Added to database: 09/08/2026, 17:24:29 UTC
Last enriched: 10/16/2026, 20:51:55 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 30
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