EUVD-2026-73387
GHSA-8jxv-x8fp-rxf8
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable, low-complexity heap overflow requiring only low-privilege SQL credentials, with full code execution impact and no scope change.
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
Heap-based buffer overflow in Microsoft SQL Server 2017 through 2025 enables an authenticated low-privilege network attacker to execute arbitrary code on the database host. The vulnerability (CWE-122) resides in a network-reachable code path, requiring only valid SQL Server credentials - no elevated database roles or special configuration. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid SQL Server login with at minimum low-privilege authentication (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score with AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H reflects a realistic threat model: authenticated low-privilege network access with full CIA impact. … 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 immediately via Microsoft Update or manual download from the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67639. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all SQL Server 2017-2025 instances in your environment and classify by criticality and network exposure. …
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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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