Vulnerability DatabaseCVE-2025-55315
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CVE-2025-55315
October 14, 2025
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
microsoft.aspnetcore.app.runtime.win-x64 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.linux-musl-x64 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.linux-arm (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.win-x64 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.linux-arm (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.linux-arm (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.win-arm64 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.osx-x64 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.win-x86 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.linux-x64 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.server.kestrel.core (NUGET):
Affected version(s) >=0.0.1-alpha <2.3.6
Fix Suggestion:
Update to version 2.3.6
microsoft.aspnetcore.app.runtime.linux-arm64 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.win-arm64 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.win-x86 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.linux-arm64 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.linux-musl-arm (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.linux-musl-arm64 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.linux-x64 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.linux-musl-arm (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.linux-musl-arm64 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.linux-arm64 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.osx-arm64 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.win-x86 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.linux-musl-arm (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.osx-x64 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.win-arm64 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.linux-musl-x64 (NUGET):
Affected version(s) >=8.0.0 <8.0.21
Fix Suggestion:
Update to version 8.0.21
microsoft.aspnetcore.app.runtime.osx-x64 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.osx-arm64 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.win-x64 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.linux-musl-x64 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.osx-arm64 (NUGET):
Affected version(s) >=9.0.0 <9.0.10
Fix Suggestion:
Update to version 9.0.10
microsoft.aspnetcore.app.runtime.linux-musl-arm64 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
microsoft.aspnetcore.app.runtime.linux-x64 (NUGET):
Affected version(s) =10.0.0-rc.1.25451.107 <10.0.0-rc.2.25502.107
Fix Suggestion:
Update to version 10.0.0-rc.2.25502.107
Related Resources (8)
https://github.com/dotnet/announcements/issues/371
https://nvd.nist.gov/vuln/detail/CVE-2025-55315
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315
https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040
https://github.com/dotnet/aspnetcore
https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/
https://github.com/dotnet/aspnetcore/security/advisories/GHSA-5rrx-jjjq-q2r5
https://github.com/dotnet/announcements/issues/372
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CVSS v4
Base Score:
9.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
LOW
CVSS v3
Base Score:
9.9
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
LOW
Exploit Maturity
UNPROVEN
Weakness Type (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-444
EPSS
Base Score:
0.17