CVE-2025-55315CRITICAL 9.9EPSS p99.2%

CVE-2025-55315CVE-2025-55315

Description

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.

Scoring

CVSS 3.19.9 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
EPSS66.26% probability of exploitation · percentile 99.2% · 2026-06-18T12:00:27Z
Published2025-10-14
Last modified2025-10-28

Underlying weaknesses· 1

CWE-444

References

  1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315
  2. https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/
  3. https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040

1

TypeTargetConfidenceTier
WeaknessInconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')cwe-4440%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.