The Update BureauKB5054977: Cumulative update for .NET Framework, versions 3.5 and 4.8, on Windows 10 21H2/22H2, April 2025. File operations on network shares are addressed
In short
The update addresses a .NET issue involving files and folders on network shares. It adds no new security improvements.
Does it affect you? Applies to: Devices running Windows 10 version 22H2 or Windows 10 Enterprise LTSC 2021 with .NET Framework 3.5 or 4.8 installed.
What changes
Fix 1 change
.NET Fundamentals
-
The update addresses a problem when .NET applications work with files and folders on network shares.1
Addresses an issue where
System.IOAPIs operate on files and directories on UNC shares.
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2025-04-08
- Classification
- Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
- KB5045936
- Replaced by
- KB5056577
| Version | File version | Channel |
|---|---|---|
| 3.5 | 2.0.50727.9179 | General availability |
| 4.8 | 4.8.4780.0 | General availability |
Security
No vulnerabilities are listed for this update.
Downloads (Microsoft Update Catalog)
x64
Windows 10 Enterprise LTSC 2021 / Windows 10, version 22H2
76.2 MB
Arm64
Windows 10 Enterprise LTSC 2021 / Windows 10, version 22H2
47.7 MB
x86
Windows 10 Enterprise LTSC 2021 / Windows 10, version 22H2
47.7 MB
Updated components
25 files changed since the previous update for the same versions.
| Top changed components | Files |
|---|---|
| .NET runtime (CLR) | 18 |
Sources
Updated
Cited passages from Microsoft's official notes (1)
-
1.
Addresses an issue where System.IO APIs are used to operate on files and directories on UNC shares.
support.microsoft.com
Checked automatically: 8 of 8 checks passed, 1 quoted passage · 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: passed
A second AI read the text against the sources: correctness 4/5, 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