.NET Core Information Disclosure Vulnerability
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 5.0, .NET Core 3.1 and .NET Core 2.1. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An information disclosure vulnerability exists in .NET 5.0, .NET Core 3.1 and .NET Core 2.1 when dumps created by the tool to collect crash dumps and dumps on demand are created with global read permissions on Linux and macOS.
Patches
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If you're using .NET 5.0, you should download and install Runtime 5.0.9 or SDK 5.0.206 (for Visual Studio 2019 v16.8) or SDK 5.0.303 (for Visual Studio 2019 V16.10) from https://dotnet.microsoft.com/download/dotnet-core/5.0.
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If you're using .NET Core 3.1, you should download and install Runtime 3.1.18 or SDK 3.1.118 (for Visual Studio 2019 v16.4) or 3.1.412 (for Visual Studio 2019 v16.7 or later) from https://dotnet.microsoft.com/download/dotnet-core/3.1.
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If you're using .NET Core 2.1, you should download and install Runtime 2.1.29 or SDK 2.1.525 (for Visual Studio 2019 v15.9) or 2.1.817 from https://dotnet.microsoft.com/download/dotnet-core/2.1.
Other Details
- Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/196
- An Issue for this can be found at https://github.com/dotnet/runtime/issues/57174
- MSRC details for this can be found at https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-34485
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Microsoft.NETCore.App | >= 2.1.0, < 2.1.29 | 2.1.29 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.linux-arm | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.linux-arm64 | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.linux-musl-arm | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.linux-musl-arm64 | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.linux-musl-x64 | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.linux-x64 | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.linux-arm | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.linux-arm64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.linux-x64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.Mono.osx-x64 | >= 5.0.0, < 5.0.9 | 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.osx-x64 | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.rhel.6-x64 | >= 3.1.0, < 3.1.18 | 3.1.18 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.win-arm | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.win-arm64 | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.win-x64 | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
| .NET (NuGet) | Microsoft.NETCore.App.Runtime.win-x86 | >= 3.1.0, < 3.1.18, >= 5.0.0, < 5.0.9 | 3.1.18, 5.0.9 |
References
- https://github.com/dotnet/runtime/security/advisories/GHSA-vgwq-hfqc-58wv
- https://nvd.nist.gov/vuln/detail/CVE-2021-34485
- https://github.com/dotnet/announcements/issues/196
- https://github.com/github/advisory-database/issues/741
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34485
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
-- Platform
- .NET (NuGet)
- Package
Microsoft.NETCore.App, Microsoft.NETCore.App.Runtime.linux-arm, Microsoft.NETCore.App.Runtime.linux-arm64- Disclosed
- 20.10.2022
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-vgwq-hfqc-58wv - CC BY 4.0
Vulnerability history: Microsoft.NETCore.App.Runtime.linux-musl-x64
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 35
- First → latest
- 09.2020 10.2026
- Without a fix
- 0
- Exploited in attacks
- 1
Severity breakdown
- High 22
- Medium 12
- Low 1
Disclosures per year
- 2020: 1
- 2021: 0
- 2022: 6
- 2023: 5
- 2024: 4
- 2025: 5
- 2026: 14
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.NET Core Information Disclosure Vulnerability this entry
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