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.NET Framework 3.5 / 4.8 .NET Framework 3.5 / 4.8 Security update
Patch Tuesday

KB5033911

KB5033911: Cumulative update for .NET Framework, versions 3.5 and 4.8, on Windows 10 1809 and Windows Server 2019, January 2024. Remoting flaw could let attackers run code on servers

In short

Addresses three .NET Framework vulnerabilities and a flaw that could let attackers run code on a server.

Does it affect you? Applies to: Devices running Windows 10, version 1809, or Windows Server 2019, with .NET Framework 3.5 or 4.8 installed.

File version
2.0.50727.9063 · 4.8.4690.0
Security
3 fixed
Restart
Required

What changes

Fixes 4 changes

.NET Framework

4 items
  • Blocks a way to bypass a security feature.1
    Addresses CVE-2024-0056, a .NET Framework security feature bypass vulnerability.
  • Closes a flaw that could let someone gain higher access.2
    Addresses CVE-2024-0057, an elevation of privilege vulnerability in .NET Framework.
  • Closes a flaw that could stop a service from working.3
    Addresses CVE-2024-21312, a .NET Framework denial of service vulnerability.
  • Closes a flaw that could let an attacker run code on a server.4
    Addresses a remote code execution vulnerability in the HTTP .NET remoting server channel chain.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2024-01-09
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaced by
KB5036610
VersionFile versionChannel
3.5 2.0.50727.9063 General availability
4.8 4.8.4690.0 General availability

Security

3 vulnerabilities fixed
3 not rated
VulnerabilitySeverityCVSS
CVE-2024-0056
Microsoft.Data.SqlClient and System.Data.SqlClient SQL Data Provider Security Feature Bypass Vulnerability
 Not rated —
CVE-2024-0057
NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability
 Not rated —
CVE-2024-21312
.NET Framework Denial of Service Vulnerability
 Not rated —

Downloads (Microsoft Update Catalog)

x64 Windows 10 Enterprise LTSC 2019 / Windows Server 2019
80.7 MB
windows10.0-kb5033911-x64-ndp48.msu Main update · KB5033911 SHA-1: fd9c7de7…373ba5
x86 Windows 10 Enterprise LTSC 2019
47.6 MB
windows10.0-kb5033911-x86-ndp48.msu Main update · KB5033911 SHA-1: fd0408ba…c4fc15

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. This security update addresses a security feature bypass vulnerability detailed in CVE-2024-0056 . support.microsoft.com
  2. 2. This security update addresses a elevation of privilege vulnerability detailed in CVE-2024-0057. support.microsoft.com
  3. 3. This security update addresses a denial of service vulnerability detailed in CVE-2024-21312 . support.microsoft.com
  4. 4. This security update addresses a remote code execution vulnerability to HTTP .NET remoting server channel chain. support.microsoft.com
Checked automatically: 7 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: not passed

A second AI read the text against the sources: correctness 5/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake