EUVD-2026-73076
GHSA-xfxq-cr26-x4w9
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable UAF without authentication; AC:H reflects kernel heap-grooming requirement; C/I/A:H reflects SYSTEM-level privilege escalation on the vulnerable host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Ancillary Function Driver for WinSock allows an unauthorized attacker to elevate privileges over a network.
AnalysisAI
Use-after-free in the Windows Ancillary Function Driver for WinSock (afd.sys) allows network-reachable unauthenticated attackers to elevate privileges to SYSTEM level on affected Windows hosts. The vulnerability spans a broad surface - every supported Windows release from Server 2012 through Windows 11 25H2 and Server 2025 is confirmed affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable code path in afd.sys is reachable via network socket activity (AV:N), requiring no prior authentication (PR:N) and no victim user interaction (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) reflects a genuine high-severity flaw: network-reachable, no authentication, no user interaction needed, and full C/I/A impact if exploitation succeeds. … 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 the vendor-released security update for the installed Windows version immediately via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows Server 2012 through Server 2025 and Windows 11 installations (up to version 25H2), prioritizing internet-facing systems and business-critical infrastructure for immediate remediation. …
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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
Leaving vuln.today