Vulnerability · Published Oct 14, 2025 · Assigned by microsoft
CVE-2025-55315ASP.NET Security Feature Bypass Vulnerability
Critical 9.9
In plain English
A critical-severity security flaw in ASP.NET Core 2.3 from Microsoft. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 67.2% (higher than 99.3% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.9Critical
Exploit odds (30 days)67.2%top 0.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | aspnetcore-runtime-8.0 | 8.0.21-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | aspnetcore-runtime-8.0 | 8.0.21-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | aspnetcore-runtime-8.0 | 8.0.21-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | aspnetcore-runtime-9.0 | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | aspnetcore-runtime-9.0 | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | aspnetcore-runtime-9.0 | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | aspnetcore-runtime-dbg-8.0 | 8.0.21-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | aspnetcore-runtime-dbg-8.0 | 8.0.21-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | aspnetcore-runtime-dbg-8.0 | 8.0.21-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | aspnetcore-runtime-dbg-9.0 | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | aspnetcore-runtime-dbg-9.0 | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | aspnetcore-runtime-dbg-9.0 | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | aspnetcore-targeting-pack-8.0 | 8.0.21-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | aspnetcore-targeting-pack-8.0 | 8.0.21-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | aspnetcore-targeting-pack-8.0 | 8.0.21-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | aspnetcore-targeting-pack-9.0 | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | aspnetcore-targeting-pack-9.0 | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | aspnetcore-targeting-pack-9.0 | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:8 | dotnet | 9.0.111-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:10 | dotnet-apphost-pack-8.0 | 8.0.21-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-apphost-pack-8.0 | 8.0.21-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-apphost-pack-8.0 | 8.0.21-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-apphost-pack-9.0 | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-apphost-pack-9.0 | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-apphost-pack-9.0 | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-host | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-host | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-host | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-hostfxr-8.0 | 8.0.21-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-hostfxr-8.0 | 8.0.21-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-hostfxr-8.0 | 8.0.21-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-hostfxr-9.0 | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-hostfxr-9.0 | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-hostfxr-9.0 | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-runtime-8.0 | 8.0.21-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-runtime-8.0 | 8.0.21-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-runtime-8.0 | 8.0.21-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-runtime-9.0 | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-runtime-9.0 | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-runtime-9.0 | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-runtime-dbg-8.0 | 8.0.21-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-runtime-dbg-8.0 | 8.0.21-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-runtime-dbg-8.0 | 8.0.21-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-runtime-dbg-9.0 | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-runtime-dbg-9.0 | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-runtime-dbg-9.0 | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-sdk-8.0 | 8.0.121-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-sdk-8.0 | 8.0.121-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-sdk-8.0 | 8.0.121-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-sdk-8.0-source-built-artifacts | 8.0.121-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-sdk-8.0-source-built-artifacts | 8.0.121-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-sdk-8.0-source-built-artifacts | 8.0.121-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-sdk-9.0 | 9.0.111-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-sdk-9.0 | 9.0.111-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-sdk-9.0 | 9.0.111-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-sdk-9.0-source-built-artifacts | 9.0.111-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-sdk-9.0-source-built-artifacts | 9.0.111-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-sdk-9.0-source-built-artifacts | 9.0.111-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-sdk-aot-9.0 | 9.0.111-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-sdk-aot-9.0 | 9.0.111-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-sdk-aot-9.0 | 9.0.111-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-sdk-dbg-8.0 | 8.0.121-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-sdk-dbg-8.0 | 8.0.121-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-sdk-dbg-8.0 | 8.0.121-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-sdk-dbg-9.0 | 9.0.111-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-sdk-dbg-9.0 | 9.0.111-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-sdk-dbg-9.0 | 9.0.111-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-targeting-pack-8.0 | 8.0.21-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-targeting-pack-8.0 | 8.0.21-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-targeting-pack-8.0 | 8.0.21-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-targeting-pack-9.0 | 9.0.10-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-targeting-pack-9.0 | 9.0.10-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-targeting-pack-9.0 | 9.0.10-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | dotnet-templates-8.0 | 8.0.121-1.el10_0 | ALSA-2025:18152 |
| AlmaLinux:8 | dotnet-templates-8.0 | 8.0.121-1.el8_10 | ALSA-2025:18148 |
| AlmaLinux:9 | dotnet-templates-8.0 | 8.0.121-1.el9_6 | ALSA-2025:18149 |
| AlmaLinux:10 | dotnet-templates-9.0 | 9.0.111-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | dotnet-templates-9.0 | 9.0.111-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | dotnet-templates-9.0 | 9.0.111-1.el9_6 | ALSA-2025:18151 |
| AlmaLinux:10 | netstandard-targeting-pack-2.1 | 9.0.111-1.el10_0 | ALSA-2025:18153 |
| AlmaLinux:8 | netstandard-targeting-pack-2.1 | 9.0.111-1.el8_10 | ALSA-2025:18150 |
| AlmaLinux:9 | netstandard-targeting-pack-2.1 | 9.0.111-1.el9_6 | ALSA-2025:18151 |
| Alpine:v3.20 | dotnet8-runtime | 8.0.21-r0 | ALPINE-CVE-2025-55315 |
| Alpine:v3.21 | dotnet8-runtime | 8.0.21-r0 | ALPINE-CVE-2025-55315 |
| Alpine:v3.22 | dotnet8-runtime | 8.0.21-r0 | ALPINE-CVE-2025-55315 |
| Alpine:v3.23 | dotnet8-runtime | 8.0.21-r0 | ALPINE-CVE-2025-55315 |
| Alpine:v3.24 | dotnet8-runtime | 8.0.21-r0 | ALPINE-CVE-2025-55315 |
| Alpine:v3.21 | dotnet9-runtime | 9.0.10-r0 | ALPINE-CVE-2025-55315 |
| Alpine:v3.22 | dotnet9-runtime | 9.0.10-r0 | ALPINE-CVE-2025-55315 |
| Alpine:v3.23 | dotnet9-runtime | 9.0.10-r0 | ALPINE-CVE-2025-55315 |
| Alpine:v3.24 | dotnet9-runtime | 9.0.10-r0 | ALPINE-CVE-2025-55315 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-arm | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-arm | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-arm | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-arm64 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-arm64 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-arm64 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-arm | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-arm | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-arm | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-arm64 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-arm64 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-arm64 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-x64 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-x64 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-musl-x64 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-x64 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-x64 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.linux-x64 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.osx-arm64 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.osx-arm64 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.osx-arm64 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.osx-x64 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.osx-x64 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.osx-x64 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-arm | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-arm | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-arm | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-arm64 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-arm64 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-arm64 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-x64 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-x64 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-x64 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-x86 | 9.0.10 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-x86 | 10.0.0-rc.2.25502.107 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.app.runtime.win-x86 | 8.0.21 | GHSA-5rrx-jjjq-q2r5 |
| NuGet | microsoft.aspnetcore.server.kestrel.core | 2.3.6 | GHSA-5rrx-jjjq-q2r5 |
| Rocky Linux:10 | dotnet8.0 | 0:8.0.121-1.el10_0 | RLSA-2025:18152 |
| Rocky Linux:8 | dotnet8.0 | 0:8.0.121-1.el8_10 | RLSA-2025:18148 |
| Rocky Linux:9 | dotnet8.0 | 0:8.0.121-1.el9_6 | RLSA-2025:18149 |
| Rocky Linux:10 | dotnet9.0 | 0:9.0.111-1.el10_0 | RLSA-2025:18153 |
| Rocky Linux:8 | dotnet9.0 | 0:9.0.111-1.el8_10 | RLSA-2025:18150 |
| Rocky Linux:9 | dotnet9.0 | 0:9.0.111-1.el9_6 | RLSA-2025:18151 |
| Ubuntu:24.04:LTS | dotnet10 | 10.0.100-10.0.0-0ubuntu1~24.04.1 | UBUNTU-CVE-2025-55315 |
| Ubuntu:25.10 | dotnet10 | 10.0.100-10.0.0~rc2-0ubuntu1~25.10.2 | USN-7822-1 |
| Ubuntu:25.10 | dotnet10 | 10.0.100-10.0.0~rc2-0ubuntu1~25.10.2 | UBUNTU-CVE-2025-55315 |
| Ubuntu:26.04:LTS | dotnet10 | 10.0.100-10.0.0~rc2-0ubuntu1 | UBUNTU-CVE-2025-55315 |
| Ubuntu:22.04:LTS | dotnet6 | no fix listed | UBUNTU-CVE-2025-55315 |
| Ubuntu:22.04:LTS | dotnet7 | no fix listed | UBUNTU-CVE-2025-55315 |
| Ubuntu:22.04:LTS | dotnet8 | 8.0.121-8.0.21-0ubuntu1~22.04.1 | USN-7822-1 |
| Ubuntu:22.04:LTS | dotnet8 | 8.0.121-8.0.21-0ubuntu1~22.04.1 | UBUNTU-CVE-2025-55315 |
| Ubuntu:24.04:LTS | dotnet8 | 8.0.121-8.0.21-0ubuntu1~24.04.1 | USN-7822-1 |
| Ubuntu:24.04:LTS | dotnet8 | 8.0.121-8.0.21-0ubuntu1~24.04.1 | UBUNTU-CVE-2025-55315 |
| Ubuntu:25.10 | dotnet8 | 8.0.121-8.0.21-0ubuntu1~25.10.1 | UBUNTU-CVE-2025-55315 |
| Ubuntu:25.10 | dotnet8 | 8.0.121-8.0.21-0ubuntu1~25.10.1 | USN-7822-1 |
| Ubuntu:25.10 | dotnet9 | 9.0.111-9.0.10-0ubuntu1~25.10.1 | UBUNTU-CVE-2025-55315 |
| Ubuntu:25.10 | dotnet9 | 9.0.111-9.0.10-0ubuntu1~25.10.1 | USN-7822-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | ASP.NET Core 2.3 | 2.3 – before 2.3.6 |
| Microsoft | ASP.NET Core 8.0 | 8.0 – before 8.0.21 |
| Microsoft | ASP.NET Core 9.0 | 9.0 – before 9.0.10 |
| Microsoft | Microsoft Visual Studio 2022 version 17.10 | 17.10.0 – before 17.10.20 |
| Microsoft | Microsoft Visual Studio 2022 version 17.12 | 17.12.0 – before 17.12.13 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – before 17.14.17 |
Weakness: CWE-444 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C