# CVE-2025-55247: Microsoft Security Advisory | .NET Denial of Service Vulnerability

Source: https://junglewise.ai/threats/cve-2025-55247-microsoft-security-advisory-net-denial-of-service-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-10-15  
License: CC BY 4.0 with a link back

CVE-2025-55247 · Severity: low · CVSS 3.1 · Published 2025-10-15

Microsoft Security Advisory CVE-2025-55247 | .NET Denial of Service Vulnerability

Technologies: [Microsoft.Build.Tasks.Core (NuGet)](https://junglewise.ai/threats/technologies/microsoft-build-tasks-core). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2025-55247 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-55247 being exploited in the wild.

**How severe is CVE-2025-55247?** Low severity, with a CVSS score of 3.1, published 15 October 2025.

**Which products and versions are affected?** Microsoft.Build (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107; Microsoft.Build.Tasks.Core (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107; Microsoft.Build.Utilities.Core (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107.

**Is there a fix for CVE-2025-55247?** Yes. Microsoft.Build (NuGet): upgrade to 18.0.0-preview-25476-107 or later; Microsoft.Build.Tasks.Core (NuGet): upgrade to 18.0.0-preview-25476-107 or later; Microsoft.Build.Utilities.Core (NuGet): upgrade to 18.0.0-preview-25476-107 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-55247?** Check whether you run Microsoft.Build (NuGet), Microsoft.Build.Tasks.Core (NuGet) or Microsoft.Build.Utilities.Core (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Microsoft.Build (NuGet): upgrade to 18.0.0-preview-25476-107 or later

  ```sh
  dotnet add package Microsoft.Build --version 18.0.0-preview-25476-107
  ```

- Microsoft.Build.Tasks.Core (NuGet): upgrade to 18.0.0-preview-25476-107 or later

  ```sh
  dotnet add package Microsoft.Build.Tasks.Core --version 18.0.0-preview-25476-107
  ```

- Microsoft.Build.Utilities.Core (NuGet): upgrade to 18.0.0-preview-25476-107 or later

  ```sh
  dotnet add package Microsoft.Build.Utilities.Core --version 18.0.0-preview-25476-107
  ```


## Affected products

- Microsoft.Build (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107
- Microsoft.Build.Tasks.Core (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107
- Microsoft.Build.Utilities.Core (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107

## Identifiers

- CVE-2025-55247
- GHSA-w3q9-fxm7-j8fq

## Related threats

- [Duplicate Advisory: Microsoft Security Advisory | .NET Denial of Service Vulnerability](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-net-denial-of-service-31c2c048)
- [Microsoft.Build.Tasks.Core .NET Spoofing Vulnerability](https://junglewise.ai/threats/cve-2025-26646-microsoft-build-tasks-core-net-spoofing-vulnerability)