EUVD-2026-56468
GHSA-c433-3382-mw5v
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector and low privilege confirmed; high complexity reflects required heap manipulation; no scope change as impact is contained to the vulnerable system.
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
4DescriptionCVE.org
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Articles & Coverage 1
AnalysisAI
Privilege escalation in the Windows Ancillary Function Driver for WinSock (afd.sys) allows a locally authenticated attacker to gain SYSTEM-level privileges through a use-after-free memory corruption flaw. Affected systems include Windows installations where the WinSock subsystem is active, which covers virtually all Windows deployments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an attacker to already possess a valid local user account or an active session on the target Windows system - the CVSS vector PR:L confirms low-privileged local authentication is necessary. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.0 reflects a local, high-complexity privilege escalation with full confidentiality, integrity, and availability impact once exploited - an accurate framing for a kernel UAF. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already compromised a low-privileged account on a Windows system - via phishing, credential theft, or exploitation of another vulnerability - executes a specially crafted program that triggers the use-after-free condition in afd.sys through a sequence of socket API calls. The exploit must perform heap grooming to position controlled data at the freed memory location, requiring precise timing or repeated attempts, which accounts for the high attack complexity rating. … |
| Remediation | The primary remediation is to apply Microsoft's official patch for CVE-2026-68820, available through Windows Update and WSUS as part of the relevant Patch Tuesday release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete Windows inventory and identify systems where non-administrative local user access exists, including service accounts, contractors, and support staff with local logon rights. …
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External POC / Exploit Code
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