IRONSMITHINTEL
HIGHCVSS7.5
|
Actively Exploited
|CISA KEV|CVE-2024-29059|Auth: none — unauthenticated|Reboot: required|Manual only

KB5033910: Windows Server Security Update (March 2024)

Microsoft .NET Framework contains an information disclosure vulnerability that exposes the ObjRef URI to an attacker, ultimately enabling remote code execution.

Published Mar 23, 2024 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss. Federal agencies are required to remediate by 2025-02-25 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Software Vulnerability (CWE-209) (CWE-209) vulnerability in Microsoft .NET Framework. .NET Framework Information Disclosure Vulnerability Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

📧

Phishing link

→

🖼

Malicious file

🔓

Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

●IT Security
●Running .net framework: 3.5, 4.7.2, 4.8, 3.5.1, 2.0, 3.0, 4.6, 4.6.2, 4.8.1, 4.7, 4.7.1
Fixed inKB5033910, KB5033917, KB5033920, KB5034119, KB5034134, KB5034269, KB5034270, KB5034272, KB5034273, KB5034274, KB5034275, KB5034276, KB5034277, KB5034278, KB5034279, KB5034280 (applies to 68 product versions) — build 10.0.10240.20402, 10.0.14393.6614+
Real-world incidentsWhat we've seen

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2025-02-04 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2025-02-25.

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 CatalogKB5033910

Manual remediation steps

Apply the Microsoft Security Update

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

Required KB Updates

    1
    KB5033910 — https://support.microsoft.com/help/5033910
    1
    KB5033917 — https://support.microsoft.com/help/5033917
    1
    KB5033920 — https://support.microsoft.com/help/5033920
    1
    KB5034119 — https://support.microsoft.com/help/5034119
    1
    KB5034134 — https://support.microsoft.com/help/5034134
    1
    KB5034269 — https://support.microsoft.com/help/5034269
    1
    KB5034270 — https://support.microsoft.com/help/5034270
    1
    KB5034272 — https://support.microsoft.com/help/5034272
    1
    KB5034273 — https://support.microsoft.com/help/5034273
    1
    KB5034274 — https://support.microsoft.com/help/5034274
    1
    KB5034275 — https://support.microsoft.com/help/5034275
    1
    KB5034276 — https://support.microsoft.com/help/5034276
    1
    KB5034277 — https://support.microsoft.com/help/5034277
    1
    KB5034278 — https://support.microsoft.com/help/5034278
    1
    KB5034279 — https://support.microsoft.com/help/5034279
    1
    KB5034280 — https://support.microsoft.com/help/5034280

Supersedes: KB5033373, KB5033379

Affected Products

    1
    Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2
    1
    Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2
    1
    Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2
    1
    Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2
    1
    Microsoft .NET Framework 3.5 AND 4.6/4.6.2 on Windows 10 for 32-bit Systems
    1
    Microsoft .NET Framework 3.5 AND 4.6/4.6.2 on Windows 10 for x64-based Systems
    1
    Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems
    1
    Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems
    1
    Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems
    1
    Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016
    1
    Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016 (Server Core installation)
    1
    Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019
    1
    Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)
    1
    Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
    1
    Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
    1
    Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems
    1
    Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems
    1
    Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems
    1
    Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems
    1
    Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems
    1
    (…48 more product versions)

Fixed Build Numbers

    1
    10.0.10240.20402
    1
    10.0.14393.6614
    1
    3.0.30729.8959
    1
    3.0.50727.8976
    1
    4.7.04081.02
    1
    4.7.04081.03
    1
    4.8.04690.01
    1
    4.8.04690.02
    1
    4.8.09214.01

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 (may or may not be required for this update)

Microsoft Update Catalog (manual download)

1
Open https://catalog.update.microsoft.com
2
Search for KB5033910
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 KB5033910 for the affected products in your update management console.

Microsoft Download Center Links

    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5033897
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5033898
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5033899
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5033900
    1
    https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5033904
    1
    (…21 more)

Verification

Confirm the update is installed:

Get-HotFix | Where-Object { $_.HotFixID -in @('KB5033910','KB5033917','KB5033920','KB5034119','KB5034134','KB5034269','KB5034270','KB5034272','KB5034273','KB5034274','KB5034275','KB5034276','KB5034277','KB5034278','KB5034279','KB5034280') }

References

    1
    Microsoft Security Response Center: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-29059
    1
    KB article: https://support.microsoft.com/help/5033910
    1
    KB article: https://support.microsoft.com/help/5033917
    1
    KB article: https://support.microsoft.com/help/5033920
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2024-29059
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-29059

Discovery Credit

Markus Wulftange with CODE WHITE GmbH

PowerShell automationComing soon

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

References

↗ CVE-2024-29059↗ MSRC Advisory↗ NVD↗ KBKB5033910