EUVD-2026-56564
GHSA-55vx-6m9g-4qcv
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack requiring low privileges and a race condition (AC:H); full CIA reflects kernel-level control post-exploit; no scope change as impact stays within the compromised host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Ancillary Function Driver for WinSock (afd.sys) allows a low-privileged local attacker to gain full system control through a use-after-free memory corruption condition. The CVSS vector (AV:L/AC:H/PR:L) confirms the attack is constrained to local access with high complexity, meaning exploitation is non-trivial and likely requires precise timing or race condition triggering. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local, authenticated session on the target Windows system with at least low-privileged account access - consistent with PR:L in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 7.0 with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H reflects a genuine but constrained risk. … 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 Microsoft security update addressing CVE-2026-70307, available through Windows Update or the Microsoft Update Catalog as part of the relevant Patch Tuesday release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems in your environment and catalog which users have local interactive logon access, particularly on remote-accessible systems or shared corporate machines. …
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External POC / Exploit Code
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