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
- Sep 21, 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
8- 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
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.