Windows CVE-2026-21236
HIGHCVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AnalysisAI
Windows Ancillary Function Driver for WinSock contains a heap buffer overflow vulnerability that enables authenticated local users to achieve privilege escalation on affected Windows 10 and Server 2012 systems. An attacker with valid user credentials can exploit this memory corruption flaw to execute arbitrary code with elevated privileges. …
Sign in for full analysis, threat intelligence, and remediation guidance.
RemediationAI
Within 24 hours: Inventory all Windows systems running affected WinSock versions and assess which have untrusted local users or service accounts. Within 7 days: Implement application whitelisting to restrict WinSock driver modifications, review and restrict local user privileges, and disable unnecessary WinSock functionality where operationally feasible. …
Sign in for detailed remediation steps.
More from same product – last 7 days
{filename} endpoint. The flawed traversal filter only rejects forward slashes and '..' sequences, leaving absolute Windo
Remote code execution in Microsoft Azure Orbital Spatio allows unauthenticated network attackers to upload dangerous fil
Unsafe deserialization in Microsoft Planetary Computer Pro (Geocatalog) lets a remote unauthenticated attacker craft mal
Remote code execution in Microsoft Power Pages allows unauthenticated network attackers to inject and execute operating-
Privilege elevation in Microsoft Azure Resource Manager (ARM) allows remote unauthenticated attackers to bypass authenti
Share
External POC / Exploit Code
Leaving vuln.today