CVE-2026-20870
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
A use-after-free vulnerability in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Risk Assessment
An attacker could exploit the flaw to execute code in kernel context, potentially gaining full system control.
Recommendation
Install the latest Windows security updates from Microsoft.
Other vulnerabilities in Windows Win32K
See all- CVE-2026-34347High
A use after free vulnerability in Windows Win32K allows an authorized attacker to elevate privileges locally.
- CVE-2026-33839High
A race condition in Windows Win32K allows an authorized attacker to locally elevate privileges due to improper synchronization during concurrent execution using shared resources.
- CVE-2026-24285High
A use after free vulnerability in Windows Win32K allows an authorized attacker to elevate privileges locally.
- CVE-2025-30388High
CVE-2025-30388 involves a heap-based buffer overflow in the Win32K driver in Windows, allowing an unauthorized attacker to execute code locally.
- CVE-2022-41109High
Vulnerability in Windows Win32k allows elevation of privilege. It could be exploited to gain higher privileges on the system.
- CVE-2022-21882HighActively exploited
Win32k Elevation of Privilege Vulnerability.
- CVE-2021-26863High
Elevation of Privilege vulnerability in Windows Win32k. Details are not provided in the description.
- CVE-2021-1732HighActively exploited
A vulnerability in the Win32k component of Windows allows elevation of privilege. An attacker could exploit it to gain higher privileges on the system.
- CVE-2019-1458HighActively exploited
A vulnerability in Windows when the Win32k component fails to properly handle objects in memory allows elevation of privilege.
- CVE-2018-8120HighActively exploited
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability.' This affects Windows Server 2008, Windows 7, Windows Server 2008 R2. This CVE ID is unique from CVE-2018-8124, CVE-2018-8164, CVE-2018-8166.
Original NVD description (English source)
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.