CVE-2025-55315
ASP.NET Security Feature Bypass Vulnerability
- Published
- Oct 14, 2025
- Updated
- Feb 22, 2026
- Assigning CNA
- microsoft
- Evidence observed
- Apr 6, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:LHigh · next 30 days
- Percentile
- 99.3%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
- CVE-2025-55315-Research
Research and analysis of CVE-2025-55315, providing a Python script for studying the vulnerability's technical details and potential exploitation methods for educational and defensive purposes.
Playground to experiment with different behavior on patched/unpatched Kestrel for the CVE-2025-55315 HTTP smuggling vulnerability
- CVE-2025-55315-PoC-ExploitExploit
CVE-2025-55315 PoC Exploit
Quick and Simple Scripts to Scan for Vulnerable Servers and Packet Level Monitors
Proof-of-concept exploit for CVE-2025-55315 (.NET HTTP Request Smuggling). Demonstrates how improperly parsed chunked encoding lets attackers smuggle requests past proxies and load balancers in vulnerable ASP.NET Core/Kestrel servers.
Proof-of-concept exploit for CVE-2025-55315, demonstrating the vulnerability and providing a working exploit for security testing and validation.
Tool that reproduces CVE-2025-55315 in ASP.NET Core.
- ASP.net 8.0.10 - BypassExploit
Mohammed Idrees Banyamer · multiple · Apr 6, 2026
Responsible use
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