EUVD-2026-73421
GHSA-x62x-ch84-xx6q
Severity by source
AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Accepts Microsoft's vector: AV:N for graphical-session delivery, AC:H for UAF complexity, PR:L for required authentication, UI:R for active session requirement.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows Win32K allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Use-after-free in the Windows Win32K kernel subsystem allows an authenticated low-privileged attacker to escalate privileges to a higher level on affected Windows systems. Win32K is the kernel-mode graphics and windowing component; UAF memory corruption in this subsystem is a well-established privilege escalation class. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a low-privileged but authenticated account on or networked to the target system - PR:L in the CVSS vector confirms a non-anonymous credential is mandatory. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.1 score reflects the genuine friction in exploiting this class: high attack complexity (AC:H) and required user interaction (UI:R) meaningfully reduce the automation potential compared to unauthenticated network exploits. … 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 | Microsoft has released patched builds for all affected versions. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems (client and server) in your environment that require the Win32K patch by consulting Microsoft advisory guidance. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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