EUVD-2026-73553
GHSA-p2ff-wwv8-rrpv
Severity by source
AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Network-accessible kernel driver; AC:H for race-condition requirement; PR:L for authenticated-only attack; UI:R per concurrent-activity requirement; full kernel-level C/I/A on success; scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation via use-after-free in the Windows HTTP.sys kernel-mode driver allows a low-privileged authenticated attacker to gain full SYSTEM-level control over affected Windows 11 and Windows Server 2025 hosts via a network attack path. The vulnerability (CWE-416) carries CVSS 7.1 with AC:H and UI:R, indicating a race-condition-dependent exploit requiring specific concurrent conditions rather than a simple reliable trigger. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a low-privilege authenticated credential valid against the target network (PR:L - unauthenticated remote exploitation is not supported by the CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite C:H/I:H/A:H impact metrics, the effective exploitability is substantially constrained by AC:H, PR:L, and UI:R simultaneously - a combination that makes reliable weaponization significantly harder than simpler EoP bugs. … 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 vendor-released cumulative updates: Windows 11 23H2 must reach build 10.0.22631.7582 or later; Windows 11 24H2 must reach 10.0.26100.9445 or later; Windows 11 25H2 must reach 10.0.26200.9445 or later; Windows 11 26H1 must reach 10.0.28000.2954 or later; Windows Server 2025 and its Server Core variant must reach 10.0.26100.33438 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 and Windows Server 2025 systems and prioritize Windows Server 2025 deployments for immediate patching. …
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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