IRONSMITHINTEL
HIGHCVSS7.8
|
Actively Exploited
|CISA KEV|CVE-2024-49138|Auth: low — authenticated user|Reboot: required|Manual only

KB5048652: Windows Server Security Update (December 2024)

Microsoft Windows Common Log File System (CLFS) driver contains a heap-based buffer overflow vulnerability that allows a local attacker to escalate privileges.

Published Dec 12, 2024 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A local attacker, with a low-privilege account, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2024-12-31 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows. Windows Common Log File System Driver Elevation of Privilege Vulnerability Exploitation requires local access, low attack complexity, a low-privilege authenticated account, and no 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 < 10.0.10240.20857; windows 10 1607: v < 10.0.14393.7606; windows 10 1809: v < 10.0.17763.6659; windows 10 21h2: v < 10.0.19044.5247; windows 10 22h2: v < 10.0.19045.5247; windows 11 22h2: v < 10.0.22621.4602; windows 11 23h2: v < 10.0.22631.4602; windows 11 24h2: v < 10.0.26100.2605; windows server 2008: -, r2, sp2; windows server 2012: -, r2; windows server 2016: v < 10.0.14393.7606; windows server 2019: v < 10.0.17763.6659; windows server 2022: v < 10.0.20348.2966; windows server 2022 23h2: v < 10.0.25398.1308; windows server 2025: v < 10.0.26100.2605
Fixed inKB5048652, KB5048653, KB5048654, KB5048661, KB5048667, KB5048671, KB5048676, KB5048685, KB5048695, KB5048699, KB5048703, KB5048710, KB5048735, KB5048744, KB5048794, KB5048800 (applies to 37 product versions) — build 10.0.10240.20857, 10.0.14393.7606+
Real-world incidentsWhat we've seen

Active exploitation documented in the wild. Threat-research write-up: https://packetstorm.news/files/id/190585/

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 CatalogKB5048652

Manual remediation steps

Apply the Microsoft Security Update

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

Required KB Updates

    1
    KB5048652 — https://support.microsoft.com/help/5048652
    1
    KB5048653 — https://support.microsoft.com/help/5048653
    1
    KB5048654 — https://support.microsoft.com/help/5048654
    1
    KB5048661 — https://support.microsoft.com/help/5048661
    1
    KB5048667 — https://support.microsoft.com/help/5048667
    1
    KB5048671 — https://support.microsoft.com/help/5048671
    1
    KB5048676 — https://support.microsoft.com/help/5048676
    1
    KB5048685 — https://support.microsoft.com/help/5048685
    1
    KB5048695 — https://support.microsoft.com/help/5048695
    1
    KB5048699 — https://support.microsoft.com/help/5048699
    1
    KB5048703 — https://support.microsoft.com/help/5048703
    1
    KB5048710 — https://support.microsoft.com/help/5048710
    1
    KB5048735 — https://support.microsoft.com/help/5048735
    1
    KB5048744 — https://support.microsoft.com/help/5048744
    1
    KB5048794 — https://support.microsoft.com/help/5048794
    1
    KB5048800 — https://support.microsoft.com/help/5048800

Supersedes: KB5046612, KB5046613, KB5046615, KB5046616, KB5046617, KB5046618, KB5046633, KB5046661, KB5046665, KB5046682, KB5046687, KB5046697, KB5046698

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
    10.0.10240.20857
    1
    10.0.14393.7606
    1
    10.0.17763.6659
    1
    10.0.19044.5247
    1
    10.0.19045.5247
    1
    10.0.20348.2908
    1
    10.0.20348.2966
    1
    10.0.22621.4602
    1
    10.0.22631.4602
    1
    10.0.25398.1308
    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 KB5048652
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 KB5048652 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5048652
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5048653
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5048654
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5048661
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5048667
    1
    (…11 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB5048652','KB5048653','KB5048654','KB5048661','KB5048667','KB5048671','KB5048676','KB5048685','KB5048695','KB5048699','KB5048703','KB5048710','KB5048735','KB5048744','KB5048794','KB5048800') }

References

    1
    Microsoft Security Response Center: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-49138
    1
    KB article: https://support.microsoft.com/help/5048652
    1
    KB article: https://support.microsoft.com/help/5048653
    1
    KB article: https://support.microsoft.com/help/5048654
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2024-49138
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-49138

Discovery Credit

Advanced Research Team with CrowdStrike

PowerShell automationComing soon

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

References

↗ CVE-2024-49138↗ MSRC Advisory↗ NVD↗ KBKB5048652