Microsoft Security Advisory CVE-2025-55247 | .NET Denial of Service Vulnerability
Date: 2025-10
Affected: nuget/Microsoft.Build.Utilities.Core, nuget/Microsoft.Build.Utilities.Core, nuget/Microsoft.Build.Utilities.Core
Attack vector: dos
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2025-55247
CWE: CWE-59
CVSS: 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H)

# Microsoft Security Advisory CVE-2025-55247 | .NET Denial of Service Vulnerability ## <a name="executive-summary"></a>Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0.xxx, .NET 9.0.xxx and .NET 10.0.xxx. This advisory also provides guidance on what developers can do to update their environments to remove this vulnerability. A vulnerability exists in .NET where predictable paths for MSBuild's temporary directories on Linux let another user create the directories ahead of MSBuild, leading to DoS of builds. This only affects .NET on Linux operating systems. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/370 ### <a name="mitigation-factors"></a>Mitigation factors Projects which do not utilize the [DownloadFile](https://learn.microsoft.com/visualstudio/msbuild/downloadfile-task) build task are not susceptible to this vulnerability. ## <a name="affected-software"></a>Affected software * Any installation of .NET 10.0.100-rc.1.25451.107 SDK or earlier. * Any installation of .NET 9.0.110 SDK, .NET 9.0.305 SDK or earlier. * Any installation of .NET 8.0.120 SDK, .NET 8.0.317 SDK, .NET 8.0.414 SDK or earlier. ## <a name="affected-packages"></a>Affected Packages The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below Package name |Affected version | Patched version ------------ |------


Mitigations:

Architectural layers (MAESTRO):