CVE & CISA-KEV Catalog

CVE-2026-20811

HIGH
7.8
CVSS v3
NVD

Description

Access of resource using incompatible type ('type confusion') in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

CWE-822Untrusted Pointer DereferenceCWE-843Type Confusion

How to fix

Remediation Available
Windows 11 Version 23H2Windows
Install:KB5073455Microsoft
Windows 11 Version 24H2Windows
Install:KB5074109Microsoft
Windows 11 Version 25H2Windows
Install:KB5074109Microsoft
Windows Server 2022Windows
Install:KB5073457Microsoft
Windows Server 2022 (Server Core installation)Windows
Install:KB5073457Microsoft
Windows Server 2022, 23H2 Edition (Server Core installation)Windows
Install:KB5073450Microsoft
Windows Server 2025Windows
Install:KB5073379Microsoft
Windows Server 2025 (Server Core installation)Windows
Install:KB5073379Microsoft

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.48%probability of exploitation in 30 days
39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-822 (Untrusted Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-21768High7.865%-Fix
CVE-2024-21338High7.860%KEV + RansomFix
CVE-2024-35250High7.825%KEVFix
CVE-2023-29360High8.422%KEVFix
CVE-2023-36033High7.812%KEVFix
CVE-2025-50165Critical9.89.5%-Fix

Common questions

How do I fix CVE-2026-20811?

Published advisories record a fix for 8 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-20811 being actively exploited?

Not that we know of. CVE-2026-20811 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.48% is the estimated probability that it will be exploited in the next 30 days. That is higher than 39% of all scored CVEs.

How severe is CVE-2026-20811?

CVE-2026-20811 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-20811 affect?

Published advisories record a fix for Windows 11 Version 23H2 (Windows), Windows 11 Version 24H2 (Windows), Windows 11 Version 25H2 (Windows), Windows Server 2022 (Windows), and 4 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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CVE-2026-20811 severity badge

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-30.