Windows 11 24h2
CVE-2026-20870
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (microsoft) · only source for this CVE.
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Win32K ICOMP component via use-after-free memory corruption affects Windows 11 (24h2, 25h2) and Windows Server 2025. An authenticated local attacker can exploit this vulnerability to gain SYSTEM-level privileges with no user interaction required. Currently no patch is available and exploitation requires local access with user-level permissions.
Technical ContextAI
Classified as CWE-416 (Use After Free). Affects Windows 11 24H2. Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
RemediationAI
Monitor vendor advisories for a patch.
More in Windows 11 24h2
View allWindows Internet Shortcut Files (.url) contain an external control vulnerability (CVE-2025-33053, CVSS 8.8) that enables
Windows SMB contains an improper access control vulnerability (CVE-2025-33073, CVSS 8.8) enabling authenticated attacker
Active Directory Domain Services contains an elevation of privilege vulnerability that allows authenticated domain users
Windows MSHTML Platform Spoofing Vulnerability. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitab
Microsoft Scripting Engine contains a type confusion vulnerability allowing unauthorized remote code execution over the
Windows Task Scheduler Elevation of Privilege Vulnerability. Rated high severity (CVSS 8.8), this vulnerability is low a
Symlink following (CWE-59) in the Windows Update Stack enables a locally authenticated attacker with standard user privi
A security feature bypass in Microsoft Management Console (MMC) allows attackers to evade security warnings and execute
Privilege escalation in the Windows Ancillary Function Driver for WinSock (afd.sys) allows a locally authenticated attac
Windows CLFS Driver contains an input validation flaw enabling local privilege escalation, yet another CLFS kernel vulne
Windows Mark of the Web Security Feature Bypass Vulnerability. Rated medium severity (CVSS 5.4), this vulnerability is r
Windows Ancillary Function Driver for WinSock contains a heap-based buffer overflow enabling local privilege escalation
Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
View allShare
External POC / Exploit Code
Leaving vuln.today