CVE-2025-55315
Critical
Description
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.
SeverityCritical
CVSS9.9
Exploit probability99. percentile67.2%
Product
Microsoft Asp.net Core
PublishedOct 14, 2025
First seenOct 14, 2025
Weakness typeCWE-444CWE-444
How to fix
Update
- microsoft asp.net_core2.3.6, 8.0.21, 9.0.10 or later
- microsoft visual_studio_202217.10.20, 17.12.13, 17.14.17 or later
- Microsoft.AspNetCore.Server.Kestrel.Core2.3.6 or later
- Microsoft.AspNetCore.App.Runtime.linux-arm10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
- Microsoft.AspNetCore.App.Runtime.linux-arm6410.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
- Microsoft.AspNetCore.App.Runtime.linux-musl-arm10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
- Microsoft.AspNetCore.App.Runtime.linux-musl-arm6410.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
- Microsoft.AspNetCore.App.Runtime.linux-musl-x6410.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
- Microsoft.AspNetCore.App.Runtime.linux-x6410.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
- Microsoft.AspNetCore.App.Runtime.osx-arm6410.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
- Microsoft.AspNetCore.App.Runtime.osx-x6410.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
- Microsoft.AspNetCore.App.Runtime.win-arm10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft asp.net_core | 2.3.0 ≤ v < 2.3.6, 8.0.0 ≤ v < 8.0.21, 9.0.0 ≤ v < 9.0.10 | 2.3.6, 8.0.21, 9.0.10 |
| microsoft visual_studio_2022 | 17.10.0 ≤ v < 17.10.20, 17.12.10 ≤ v < 17.12.13, 17.14.0 ≤ v < 17.14.17 | 17.10.20, 17.12.13, 17.14.17 |
| Microsoft.AspNetCore.Server.Kestrel.CoreNuGet | v < 2.3.6 | 2.3.6 |
| Microsoft.AspNetCore.App.Runtime.linux-armNuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-armNuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.linux-x64NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.osx-arm64NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.osx-x64NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.win-armNuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.win-arm64NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.win-x64NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
| Microsoft.AspNetCore.App.Runtime.win-x86NuGet | 10.0.0-rc.1.25451.107 ≤ v < 10.0.0-rc.2.25502.107, 9.0.0 ≤ v < 9.0.10, 8.0.0 ≤ v < 8.0.21 | 10.0.0-rc.2.25502.107, 9.0.10, 8.0.21 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.