CVE-2025-30399

Untrusted search path in .NET and Visual Studio allows an unauthorized attacker to execute code over a network.

Microsoft Security Advisory CVE-2025-30399 | .NET Remote Code Vulnerability

<a name="executive-summary"></a>Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0 and .NET 9.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

An attacker could exploit this vulnerability by placing files in particular locations, leading to unintended code execution.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/362

<a name="mitigation-factors"></a>Mitigation factors

Microsoft has not identified any mitigating factors for this vulnerability.

<a name="affected-software"></a>Affected software

• Any .NET 8.0 application running on .NET 8.0.16 or earlier.
• Any .NET 9.0 application running on .NET 9.0.5 or earlier.

<a name="affected-packages"></a>Affected Packages

The vulnerability affects any Microsoft .NET project if it uses any of affected packages versions listed below

<a name=".NET 9"></a>.NET 9

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.NetCore.App.Runtime.linux-arm | >= 9.0.0, <= 9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.linux-arm64 | >= 9.0.0, <= 9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 9.0.0, <= 9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 9.0.0, < =9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 9.0.0, <= 9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.linux-x64 | >= 9.0.0, < =9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.osx-arm64 | >= 9.0.0, < =9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.osx-x64 | >= 9.0.0, <= 9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.win-arm | >= 9.0.0, <= 9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.win-arm64 | >= 9.0.0, <= 9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.win-x64 | >= 9.0.0, <= 9.0.5 | 9.0.6 Microsoft.NetCore.App.Runtime.win-x86 | >= 9.0.0, <= 9.0.5 | 9.0.6

<a name=".NET 8"></a>.NET 8

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.NetCore.App.Runtime.linux-arm | >= 8.0.0, <= 8.0.16 | 8.0.17 Microsoft.NetCore.App.Runtime.linux-arm64 | >= 8.0.0, <= 8.0.16 | 8.0.17 Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 8.0.0, <= 8.0.16 | 8.0.17 Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 8.0.0, <= 8.0.16 | 8.0.17…

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.117 and .NET Runtime 8.0.17.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.117 and .NET Runtime 8.0.17.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.117 and .NET Runtime 8.0.17.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.107 and .NET Runtime 9.0.6.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.107 and .NET Runtime 9.0.6.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.107 and .NET Runtime 9.0.6.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Untrusted search path in .NET and Visual Studio allows an unauthorized attacker to execute code over a network.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.117 and .NET Runtime 8.0.17.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.117 and .NET Runtime 8.0.17.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.117 and .NET Runtime 8.0.17.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.107 and .NET Runtime 9.0.6.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.107 and .NET Runtime 9.0.6.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 9.0.107 and .NET Runtime 9.0.6.Security Fix(es):

• dotnet: .NET Remote Code Vulnerability (CVE-2025-30399)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Untrusted search path in .NET and Visual Studio allows an unauthorized attacker to execute code over a network.

Untrusted search path in .NET and Visual Studio allows an unauthorized attacker to execute code over a network.

Untrusted search path in .NET and Visual Studio allows an unauthorized attacker to execute code over a network.

It was discovered that .NET did not properly validate search path in Microsoft.NETCore.App.Runtime. An attacker could possibly use this issue to execute arbitrary code.