CVE-2026-67633
Microsoft SQL Server Denial of Service Vulnerability
Out-of-bounds read in SQL Server allows an authorized attacker to deny service over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft SQL Server Denial of Service Vulnerability
Out-of-bounds read in SQL Server allows an authorized attacker to deny service over a network.
- Record
CVE-2026-67633- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C - Weakness
- CWE-125
- Updated
- 2026-11-02
EUVDEUVD-2026-73186
Out-of-bounds read in SQL Server allows an authorized attacker to deny service over a network.
- Record
EUVD-2026-73186- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c5hp-67h3-xjp7
Out-of-bounds read in SQL Server allows an authorized attacker to deny service over a network.
Out-of-bounds read in SQL Server allows an authorized attacker to deny service over a network.
- Record
GHSA-c5hp-67h3-xjp7- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
NVD
Out-of-bounds read in SQL Server allows an authorized attacker to deny service over a network.
- Record
CVE-2026-67633- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
Affected products
- microsoft sql server 2017 (cu 31)
- microsoft sql server 2017 (gdr)
- microsoft sql server 2019 (cu 32)
- microsoft sql server 2019 (gdr)
- microsoft sql server 2022 (cu 26)
- microsoft sql server 2022 (gdr)
- microsoft sql server 2025 (cu8)
- microsoft sql server 2025 for x64-based systems (gdr)
- microsoft sql server 2017
- microsoft sql server 2019
- microsoft sql server 2022
- microsoft sql server 2025
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-67633 is a medium vulnerability (CVSS 6.5) in Microsoft Sql Server 2017 (cu 31), published September 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.14%, the 66th percentile. No source names a fixed version.