Windows
CVE-2026-20810
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AnalysisAI
The Windows Ancillary Function Driver for WinSock contains an improper memory deallocation vulnerability (CWE-590) that allows authenticated local attackers to achieve privilege escalation on affected Windows 10 and Windows Server 2019 systems. An attacker with local user privileges can exploit this flaw to gain SYSTEM-level access without user interaction. No patch is currently available for this vulnerability.
Technical ContextAI
Affects the Windows Ancillary component of Windows 10 1809. Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
RemediationAI
Monitor vendor advisories for a patch.
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Same weakness CWE-590 – Free of Memory not on the Heap
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External POC / Exploit Code
Leaving vuln.today