EUVD-2026-73443
GHSA-5vmq-vjg2-r39r
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Authenticated low-privilege user triggers Win32K kernel overflow remotely via RDP (AV:N/PR:L); UI:R required; kernel compromise yields full C/I/A:H with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Stack-based buffer overflow in Win32K, the Windows kernel-mode graphics and windowing subsystem, allows a low-privileged authenticated attacker to escalate privileges to SYSTEM level across a wide range of Microsoft Windows client and server editions. The network attack vector (AV:N) combined with user interaction requirement (UI:R) indicates the vulnerable code path can be triggered remotely, most plausibly through Remote Desktop Protocol sessions where Win32K processes graphical input on behalf of remote users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a low-privileged authenticated account on the target Windows system (PR:L) - an attacker must first obtain valid credentials or initial access as a standard user. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.0 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H) represents a meaningful network-accessible privilege escalation risk in one of the most widely deployed operating systems globally. … 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 for your specific Windows version immediately via Windows Update or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all Windows systems across your environment and document which editions and versions are in use; confirm whether RDP is enabled and exposed on each system, particularly in DMZs and remote access gateways. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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