IRONSMITHINTEL
MEDIUMCVSS6.5
|
Actively Exploited
|CISA KEV|CVE-2024-38213|Auth: none — unauthenticated|Reboot: required|Manual only

KB5039211: Windows Server Security Update (August 2024)

Microsoft Windows SmartScreen contains a security feature bypass vulnerability that allows an attacker to bypass the SmartScreen user experience via a malicious file.

Published Aug 13, 2024 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve partial data exposure, arbitrary modification of data. Federal agencies are required to remediate by 2024-09-03 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Software Vulnerability (CWE-693) (CWE-693) vulnerability in Microsoft Windows. Windows Mark of the Web Security Feature Bypass Vulnerability Exploitation requires remote network access, low attack complexity, no authentication required, and user interaction required.

📧

Phishing link

→

🖼

Malicious file

🔓

Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

●Windows Administrators
●Systems Engineers
●IT Security
●Running windows 10 1507: v < 10.0.10240.20680; windows 10 1607: v < 10.0.14393.7070; windows 10 1809: v < 10.0.17763.5936; windows 10 21h2: v < 10.0.19044.4529; windows 10 22h2: v < 10.0.19045.4529; windows 11 21h2: v < 10.0.22000.3019; windows 11 22h2: v < 10.0.22621.3737; windows 11 23h2: v < 10.0.22631.3737; windows server 2012: v < 6.2.9200.24919, r2; windows server 2016: v < 10.0.14393.7070; windows server 2019: v < 10.0.17763.5936; windows server 2022: v < 10.0.20348.2522; windows server 2022 23h2: v < 10.0.25398.950
Fixed inKB5039211, KB5039212, KB5039213, KB5039214, KB5039217, KB5039225, KB5039227, KB5039236, KB5039260, KB5039294, KB5039330 (applies to 29 product versions) — build 10.0.10240.20680, 10.0.14393.7070+
Real-world incidentsWhat we've seen

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2024-08-13 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2024-09-03.

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 CatalogKB5039211

Manual remediation steps

Apply the Microsoft Security Update

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

Required KB Updates

    1
    KB5039211 — https://support.microsoft.com/help/5039211
    1
    KB5039212 — https://support.microsoft.com/help/5039212
    1
    KB5039213 — https://support.microsoft.com/help/5039213
    1
    KB5039214 — https://support.microsoft.com/help/5039214
    1
    KB5039217 — https://support.microsoft.com/help/5039217
    1
    KB5039225 — https://support.microsoft.com/help/5039225
    1
    KB5039227 — https://support.microsoft.com/help/5039227
    1
    KB5039236 — https://support.microsoft.com/help/5039236
    1
    KB5039260 — https://support.microsoft.com/help/5039260
    1
    KB5039294 — https://support.microsoft.com/help/5039294
    1
    KB5039330 — https://support.microsoft.com/help/5039330

Supersedes: KB5037763, KB5037765, KB5037768, KB5037770, KB5037771, KB5037778, KB5037781, KB5037782, KB5037788, KB5037823, KB5037848

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 21H2 for ARM64-based Systems
    1
    Windows 11 version 21H2 for x64-based Systems
    1
    Windows Server 2012
    1
    Windows Server 2012 (Server Core installation)
    1
    (…9 more product versions)

Fixed Build Numbers

    1
    10.0.10240.20680
    1
    10.0.14393.7070
    1
    10.0.17763.5936
    1
    10.0.19044.4529
    1
    10.0.19045.4529
    1
    10.0.20348.2522
    1
    10.0.20348.2527
    1
    10.0.22000.3019
    1
    10.0.22621.3737
    1
    10.0.22631.3737
    1
    (…3 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 KB5039211
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 KB5039211 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5039211
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5039212
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5039213
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5039214
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5039217
    1
    (…6 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB5039211','KB5039212','KB5039213','KB5039214','KB5039217','KB5039225','KB5039227','KB5039236','KB5039260','KB5039294','KB5039330') }

References

    1
    Microsoft Security Response Center: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38213
    1
    KB article: https://support.microsoft.com/help/5039211
    1
    KB article: https://support.microsoft.com/help/5039212
    1
    KB article: https://support.microsoft.com/help/5039213
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2024-38213
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38213

Discovery Credit

Simon Zuckerbraun and Peter Girnus (@gothburz) of Trend Micro with Trend Micro

PowerShell automationComing soon

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

References

↗ CVE-2024-38213↗ MSRC Advisory↗ NVD↗ KBKB5039211