Vulnerability in Microsoft Asp.net Core 2.3
CVE-2025-55315
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.
Vulnerability class: HTTP Request Smuggling
EPSS: 0.017 (82.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). 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.
Affected products
- Microsoft Asp.net Core 2.3 — versions 2.3
- Microsoft Asp.net Core 8.0 — versions 8.0
- Microsoft Asp.net Core 9.0 — versions 9.0
- Microsoft Visual Studio 2022 Version 17.10 — versions 17.10.0
- Microsoft Visual Studio 2022 Version 17.12 — versions 17.12.0
- Microsoft Visual Studio 2022 Version 17.14 — versions 17.14.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- ASP.NET Security Feature Bypass Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2025-55315?
- CVE-2025-55315 is a critical-severity vulnerability in Microsoft Asp.net Core 2.3, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 9.9/10. Published 2025-10-14.
- How severe is CVE-2025-55315?
- Critical severity. CVSS v3 base score is 9.9 out of 10.
- Is CVE-2025-55315 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.