Is CVE-2026-20811 in the CISA KEV catalog?

No. CVE-2026-20811 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-20811?

CVE-2026-20811 has a CVSS v3 base score of 7.8 (Important).

What is the EPSS score for CVE-2026-20811?

CVE-2026-20811 has an EPSS score of 0.48% (39th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-20811?

Install KB5073455 for Windows 11 Version 23H2. Fixes are available for 8 affected products.

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 Dereference CWE-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/E:U/RL:O/RC:C

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

msrc.microsoft.com

Related Vulnerabilities

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

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21768	High	7.8	65%	-	Fix
CVE-2024-21338	High	7.8	52%	KEV + Ransom	Fix
CVE-2024-35250	High	7.8	25%	KEV	Fix
CVE-2023-29360	High	8.4	22%	KEV	Fix
CVE-2023-36033	High	7.8	12%	KEV	Fix
CVE-2019-13334	High	7.8	6.8%	-	-

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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 2026-01-14.