IRONSMITHINTEL
HIGHCVSS7.8
|
Actively Exploited
|CISA KEV|CVE-2025-24985|Auth: none — unauthenticated|Reboot: required|Manual only

KB5053594: Windows Server Security Update (March 2025)

Microsoft Windows Fast FAT File System Driver contains an integer overflow or wraparound vulnerability that allows an unauthorized attacker to execute code locally.

Published Mar 11, 2025 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A local attacker, without authentication, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2025-04-01 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows. Integer overflow or wraparound in Windows Fast FAT Driver allows an unauthorized attacker to execute code locally. Exploitation requires local access, low attack complexity, no authentication required, and user interaction required.

Am I affected?Quick check

Probably yes if any of these apply:

●Windows Administrators
●Systems Engineers
●IT Security
●Running windows 10 1507: v < 10.0.10240.20947; windows 10 1607: v < 10.0.14393.7876; windows 10 1809: v < 10.0.17763.7009; windows 10 21h2: v < 10.0.19044.5608; windows 10 22h2: v < 10.0.19045.5608; windows 11 22h2: v < 10.0.22621.5039; windows 11 23h2: v < 10.0.22631.5039; windows 11 24h2: v < 10.0.26100.3403; windows server 2008: -, r2; windows server 2012: -, r2; windows server 2016: v < 10.0.14393.7876; windows server 2019: v < 10.0.17763.7009; windows server 2022: v < 10.0.20348.3270; windows server 2022 23h2: v < 10.0.25398.1486; windows server 2025: v < 10.0.26100.3403
Fixed inKB5053594, KB5053596, KB5053598, KB5053599, KB5053602, KB5053603, KB5053606, KB5053618, KB5053620, KB5053627, KB5053636, KB5053638, KB5053886, KB5053887, KB5053888, KB5053995 (applies to 37 product versions) — build 10.0.10240.20947, 10.0.14393.7876+
Real-world incidentsWhat we've seen

Active exploitation documented in the wild. Threat-research write-up: https://www.vicarius.io/vsociety/posts/cve-2025-24985-integer-overflow-vulnerability-in-microsoft-windows-fast-fat-driver-detection-script

How to patch

Manual download

For air-gapped servers or out-of-band deployment. Microsoft Update Catalog returns every OS-version variant of this update.

↗ Microsoft Update CatalogKB5053594

Manual remediation steps

Apply the Microsoft Security Update

Microsoft has released an official security update that fixes this vulnerability.

Required KB Updates

    1
    KB5053594 — https://support.microsoft.com/help/5053594
    1
    KB5053596 — https://support.microsoft.com/help/5053596
    1
    KB5053598 — https://support.microsoft.com/help/5053598
    1
    KB5053599 — https://support.microsoft.com/help/5053599
    1
    KB5053602 — https://support.microsoft.com/help/5053602
    1
    KB5053603 — https://support.microsoft.com/help/5053603
    1
    KB5053606 — https://support.microsoft.com/help/5053606
    1
    KB5053618 — https://support.microsoft.com/help/5053618
    1
    KB5053620 — https://support.microsoft.com/help/5053620
    1
    KB5053627 — https://support.microsoft.com/help/5053627
    1
    KB5053636 — https://support.microsoft.com/help/5053636
    1
    KB5053638 — https://support.microsoft.com/help/5053638
    1
    KB5053886 — https://support.microsoft.com/help/5053886
    1
    KB5053887 — https://support.microsoft.com/help/5053887
    1
    KB5053888 — https://support.microsoft.com/help/5053888
    1
    KB5053995 — https://support.microsoft.com/help/5053995

Supersedes: KB5051974, KB5051979, KB5051980, KB5051987, KB5051989, KB5052000, KB5052006, KB5052016, KB5052020, KB5052038, KB5052040, KB5052042, KB5052105, KB5052106

Affected Products

    1
    Windows 10 Version 1607 for 32-bit Systems
    1
    Windows 10 Version 1607 for x64-based Systems
    1
    Windows 10 Version 1809 for 32-bit Systems
    1
    Windows 10 Version 1809 for x64-based Systems
    1
    Windows 10 Version 21H2 for 32-bit Systems
    1
    Windows 10 Version 21H2 for ARM64-based Systems
    1
    Windows 10 Version 21H2 for x64-based Systems
    1
    Windows 10 Version 22H2 for 32-bit Systems
    1
    Windows 10 Version 22H2 for ARM64-based Systems
    1
    Windows 10 Version 22H2 for x64-based Systems
    1
    Windows 10 for 32-bit Systems
    1
    Windows 10 for x64-based Systems
    1
    Windows 11 Version 22H2 for ARM64-based Systems
    1
    Windows 11 Version 22H2 for x64-based Systems
    1
    Windows 11 Version 23H2 for ARM64-based Systems
    1
    Windows 11 Version 23H2 for x64-based Systems
    1
    Windows 11 Version 24H2 for ARM64-based Systems
    1
    Windows 11 Version 24H2 for x64-based Systems
    1
    Windows Server 2008 R2 for x64-based Systems Service Pack 1
    1
    Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
    1
    (…17 more product versions)

Fixed Build Numbers

    1
    10.0.10240.20947
    1
    10.0.14393.7876
    1
    10.0.17763.7009
    1
    10.0.19044.5608
    1
    10.0.19045.5608
    1
    10.0.20348.3270
    1
    10.0.20348.3328
    1
    10.0.22621.5039
    1
    10.0.22631.5039
    1
    10.0.25398.1486
    1
    (…6 more builds)

Installation Methods

Windows Update (recommended)

1
Settings → Windows Update → Check for updates
2
The security update is offered if your system is in scope
3
Restart when prompted — a reboot IS required to complete the install

Microsoft Update Catalog (manual download)

1
Open https://catalog.update.microsoft.com
2
Search for KB5053594
3
Download the package matching your OS architecture and Windows build
4
Run the .msu installer with administrator privileges
5
Restart when prompted

WSUS / SCCM / Intune

Approve KB5053594 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5053594
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5053596
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5053598
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5053599
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5053602
    1
    (…9 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB5053594','KB5053596','KB5053598','KB5053599','KB5053602','KB5053603','KB5053606','KB5053618','KB5053620','KB5053627','KB5053636','KB5053638','KB5053886','KB5053887','KB5053888','KB5053995') }

References

    1
    Microsoft Security Response Center: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-24985
    1
    KB article: https://support.microsoft.com/help/5053594
    1
    KB article: https://support.microsoft.com/help/5053596
    1
    KB article: https://support.microsoft.com/help/5053598
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2025-24985
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-24985

Discovery Credit

Anonymous

PowerShell automationComing soon

No tested PowerShell script for this entry yet. We’re prioritising automation based on user demand.

References

↗ CVE-2025-24985↗ MSRC Advisory↗ NVD↗ KBKB5053594