EUVD-2026-73379
GHSA-82pw-m47h-m5xj
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable SQL listener, low complexity overflow; PR:L reflects the required authenticated credential; full C/I/A reflects code execution on the database process.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution is possible in Microsoft SQL Server 2017 through 2025 via a heap-based buffer overflow (CWE-122) triggered over a network connection by a low-privileged authenticated attacker. The vulnerability spans all major in-support release branches including GDR and Cumulative Update servicing tracks, with fixed builds identified across eight distinct release configurations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid SQL Server authentication credential (SQL login, Windows-authenticated account, or any account granted CONNECT permission to the targeted database instance). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) is well-justified: the attack is network-reachable, requires no user interaction, has low complexity, and yields full C/I/A compromise on the SQL Server process. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patches via the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67380. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Microsoft SQL Server 2017, 2019, 2022, and 2025 instances across your infrastructure and document their versions and network accessibility, then implement network access controls to restrict SQL Server access from untrusted sources. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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