Vulnerability in Microsoft Asp.net Core
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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.659 (99.3th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.659 · newest: 0.659 · change: 0.000
Affected products
- Microsoft Asp.net Core
- 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
- Microsoft Visual Studio 2022
Weakness classification (CWE)
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315 (vendor-advisory, patch, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
Frequently asked questions
- What is CVE-2025-55315?
- CVE-2025-55315 is a critical-severity vulnerability in Microsoft Asp.net Core, 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?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.