EUVD-2026-73097
GHSA-c7rx-c2q4-m77r
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Local heap overflow requiring admin privileges (PR:H, AV:L); full C/I/A impact reflects reliable SYSTEM-level code execution post-escalation with no interaction needed.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in Windows Installer (msiexec) enables local privilege escalation across a broad range of Microsoft Windows client and server releases. An attacker with high-privileged local access can exploit this CWE-122 flaw to achieve full system-level code execution - compromising confidentiality, integrity, and availability - making it a post-exploitation escalation primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a local session with high-privileged (administrator-level) credentials on the target Windows host; the CVSS AV:L/AC:L/PR:H/UI:N vector confirms this. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 6.7 with AV:L/AC:L/PR:H/UI:N reflects a constrained but reliable exploitation path: local access and existing administrative (high) privileges are required before the flaw can be triggered. … 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 Microsoft's security update addressing CVE-2026-71339, available via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
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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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