IRONSMITHINTEL
MEDIUMCVSS5.5
|
Actively Exploited
|CISA KEV|CVE-2025-24991|Auth: none — unauthenticated|Reboot: required|Manual only

KB5053594: Windows Server Security Update (March 2025)

Microsoft Windows New Technology File System (NTFS) contains an out-of-bounds read vulnerability that allows an authorized attacker to disclose information 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. Federal agencies are required to remediate by 2025-04-01 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Out-of-bounds Read (CWE-125) vulnerability in Microsoft Windows. Out-of-bounds read in Windows NTFS allows an authorized attacker to disclose information 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

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2025-03-11 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2025-04-01.

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-2025-24991
    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-2025-24991
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-24991

Discovery Credit

Anonymous

PowerShell automationComing soon

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

References

↗ CVE-2025-24991↗ MSRC Advisory↗ NVD↗ KBKB5053594