Is CVE-2025-55696 in the CISA KEV catalog?

No. CVE-2025-55696 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-55696?

CVE-2025-55696 has a CVSS v3 base score of 7.8 (Important).

What is the EPSS score for CVE-2025-55696?

CVE-2025-55696 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-55696?

Install KB5066586 for Windows 10 Version 1809. Fixes are available for 14 affected products.

CVE & CISA-KEV Catalog

CVE-2025-55696

HIGH

7.8

CVSS v3

NVD

Description

Time-of-check time-of-use (toctou) race condition in NtQueryInformation Token function (ntifs.h) allows an authorized attacker to elevate privileges locally.

CWE-367TOCTOU Race Condition CWE-822Untrusted Pointer Dereference

How to fix

Remediation Available

Windows 10 Version 1809Windows

Install:KB5066586Microsoft

Windows 10 Version 21H2Windows

Install:KB5066791Microsoft

Windows 10 Version 22H2Windows

Install:KB5066791Microsoft

Windows 11 Version 22H2Windows

Install:KB5066793Microsoft

Windows 11 Version 23H2Windows

Install:KB5066793Microsoft

Windows 11 Version 24H2Windows

Install:KB5066835Microsoft

Windows 11 Version 25H2Windows

Install:KB5066835Microsoft

Windows Server 2019Windows

Install:KB5066586Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5066586Microsoft

Windows Server 2022Windows

Install:KB5066782Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5066782Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)Windows

Install:KB5066780Microsoft

Windows Server 2025Windows

Install:KB5066835Microsoft

Windows Server 2025 (Server Core installation)Windows

Install:KB5066835Microsoft

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

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory1

msrc.microsoft.com

Related Vulnerabilities

Other CWE-367 (TOCTOU Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-36980	High	8.1	83%	-	Fix
CVE-2024-30088	High	7.0	68%	KEV + Ransom	Fix
CVE-2004-0594	Medium	5.1	55%	-	Fix
CVE-2024-50379	Critical	9.8	44%	-	Fix
CVE-2023-38146	High	8.8	39%	-	Fix
CVE-2024-0132	Critical	9.0	37%	-	Fix

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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 2025-10-30.