EUVD-2026-73648
GHSA-425x-vjqw-cpxf
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack requiring low privileges and high complexity to reliably exploit heap overflow in a privileged Windows service, yielding full SYSTEM-level compromise upon success.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows Defender Firewall Service (mpssvc) allows an authenticated local attacker holding only standard user privileges to escalate to SYSTEM-level access on affected Windows systems. The vulnerability spans every major Windows release from Server 2012 through Windows 11 26H1 and Windows Server 2025, covering both client and server deployments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already possess low-privilege authenticated local access to the target Windows system (PR:L), whether via interactive logon, RDP, WinRM, or other remote session mechanisms. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS score of 7.0 with AV:L/AC:H/PR:L accurately captures the tension between severe potential impact (C:H/I:H/A:H - full SYSTEM compromise) and meaningful exploitation barriers: the attacker must already have an authenticated local foothold, and AC:H indicates the heap overflow cannot be trivially triggered or made reliable without specific memory conditions. … 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 updates for each affected Windows version as detailed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70568. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct inventory scans to identify all Windows Server 2012+ and Windows 11 systems (including 26H1 builds) with multiuser local access, prioritizing high-value and internet-facing assets. …
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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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