CVE-2025-21176 .NET, .NET Framework, and Visual Studio Remote Code Execution Vulnerability
High 8.8
Published
Updated
Check this codebase for CVE-2025-21176 and fix it if it is affected.
What it is: CVE-2025-21176 is a high-severity memory corruption vulnerability in Microsoft .Net, published on 14 Jan 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-21176 in the wild and no public exploit code.
Affected packages and fixed versions:
- Microsoft.NetCore.App.Runtime.linux-arm (NuGet): affected from 8.0.0; fixed in 8.0.12
- Microsoft.NetCore.App.Runtime.linux-arm (NuGet): affected from 8.0.0; fixed in 8.0.12
- Microsoft.NetCore.App.Runtime.linux-arm (NuGet): affected from 9.0.0; fixed in 9.0.1
- Microsoft.NetCore.App.Runtime.linux-arm (NuGet): affected from 9.0.0; fixed in 9.0.1
- dotnet (Bitnami): affected from 8.0.0; fixed in 8.0.1, 9.0.1
- dotnet-sdk (Bitnami): affected from 8.0.0; fixed in 8.0.101, 9.0.100
- Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): affected from 8.0.0; fixed in 8.0.12
- Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): affected from 8.0.0; fixed in 8.0.12
- Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): affected from 9.0.0; fixed in 9.0.1
- Microsoft.NetCore.App.Runtime.linux-arm64 (NuGet): affected from 9.0.0; fixed in 9.0.1
- Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): affected from 8.0.0; fixed in 8.0.12
- Microsoft.NetCore.App.Runtime.linux-musl-arm (NuGet): affected from 8.0.0; fixed in 8.0.12
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2025-21176/ (Markdown: https://insights.sbomify.com/CVE-2025-21176/index.md)
Remote code execution vulnerability in .NET and Visual Studio allows attackers to execute arbitrary code via memory corruption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-21176?
CVE-2025-21176 is a high-severity memory corruption vulnerability in Microsoft .Net, published on 14 Jan 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
.NET, .NET Framework, and Visual Studio Remote Code Execution Vulnerability
Weakness: CWE-126
Which versions are affected by CVE-2025-21176?
40 open source packages ship an affected version, including Microsoft.NetCore.App.Runtime.linux-arm, dotnet and dotnet-sdk. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.NetCore.App.Runtime.linux-arm NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-arm NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-arm NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-arm NuGet | From 9.0.0 | 9.0.1 |
dotnet Bitnami | From 8.0.0 | 8.0.1, 9.0.1 |
dotnet-sdk Bitnami | From 8.0.0 | 8.0.101, 9.0.100 |
34 more packages
Microsoft.NetCore.App.Runtime.linux-arm64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-arm64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-arm64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-arm64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-musl-arm NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-musl-arm NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-musl-arm NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-musl-arm NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-musl-arm64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-musl-arm64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-musl-arm64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-musl-arm64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-musl-x64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-musl-x64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-musl-x64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-musl-x64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-x64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-x64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.linux-x64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.linux-x64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.osx-arm64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.osx-arm64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.osx-arm64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.osx-arm64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.osx-x64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.osx-x64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.osx-x64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.osx-x64 NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.win-arm NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.win-arm NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.win-arm NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.win-arm NuGet | From 9.0.0 | 9.0.1 |
Microsoft.NetCore.App.Runtime.win-arm64 NuGet | From 8.0.0 | 8.0.12 |
Microsoft.NetCore.App.Runtime.win-arm64 NuGet | From 8.0.0 | 8.0.12 |
Products include Microsoft .Net, Microsoft .Net Framework, Microsoft Visual Studio 2017.
How do I fix CVE-2025-21176?
Upgrade Microsoft.NetCore.App.Runtime.linux-arm to a fixed version for your release line: 8.0.12 or 9.0.1.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-21176 being exploited?
There is no known exploitation of CVE-2025-21176 in the wild and no public exploit code.
Other vulnerabilities in Microsoft .Net
- CVE-2024-43498 .NET and Visual Studio Remote Code Execution Vulnerability
- CVE-2024-0057 NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability
- CVE-2026-96957 .NET Security Feature Bypass Vulnerability
- CVE-2026-69439 .NET and Visual Studio Elevation of Privilege Vulnerability
- CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability
Sources
Also known as BELL-CVE-2025-21176, BIT-dotnet-2025-21176, BIT-dotnet-sdk-2025-21176, GHSA-gjf6-3w4p-7xfh, UBUNTU-CVE-2025-21176.