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CVE-2026-67373 Microsoft CVE debrief

CVE-2026-67373 is a high-severity vulnerability in Microsoft SQL Server 2025, allowing an authorized attacker to execute code over a network via a heap-based buffer overflow. The CVE record was published on 2026-09-08T18:18:20.950Z and was last modified on 2026-09-16T12:02:15.647Z. The NVD entry is currently Analyzed. This vulnerability has a CVSS score of 8.8 and is considered high severity. The affected versions are SQL Server 2025. Evidence is based on official CVE and NVD records, with limited details on exploitation or impact. Defenders should assess their exposure and prioritize patching or mitigation, especially in environments where SQL Server 2025 is exposed to the network

Vendor
Microsoft
Product
SQL Server 2025
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-16
Advisory published
2026-09-08
Advisory updated
2026-09-16

Who should care

Defenders and administrators responsible for SQL Server 2025 instances, especially those exposed to the network or used by authorized users, should assess their exposure and prioritize patching or mitigation.

Why it matters

CVE-2026-67373 is a high-severity vulnerability in SQL Server 2025 that allows authorized attackers to execute code over a network. Defenders should prioritize patching, restrict network access, and monitor logs. Evidence is based on official CVE and NVD records, with limited details on exploitation or impact.

  • Potential code execution by authorized attackers over the network.
  • Possible disruption of critical database services.
  • Potential data tampering or unauthorized access.
  • Need for verification of patch application and system integrity.

Technical summary

The vulnerability is a heap-based buffer overflow in Microsoft SQL Server 2025, which allows an authorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.8 and is considered high severity. The affected versions are SQL Server 2025, with specific CPE criteria indicating vulnerable versions.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments where SQL Server 2025 is exposed to the network or used by authorized users.

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable SQL Server 2025 instances.
  • Restrict network access to SQL Server 2025 to only necessary users and services.
  • Monitor SQL Server 2025 logs and network activity for potential exploitation attempts.
  • Verify and enforce secure configuration and authentication mechanisms for SQL Server 2025.

Evidence notes

The CVE description and NVD detail page indicate a heap-based buffer overflow in SQL Server 2025, allowing code execution over a network by an authorized attacker. Vendor advisory and patch information are available.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-67373 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-67373

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-67373 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-67373

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.