CVE-2025-55315

CRITICAL EPSS 99.2%
Published Oct 14, 20258mo ago · Modified Jun 17, 20262w ago
9.9 CVSS 3.1
Critical
Find Similar
Published Oct 14, 2025 8mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.9
Exploitability
3.1
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability Low

Threat Intelligence

EPSS Exploit Probability
99.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-444

Affected Products 6

VendorProductVersionRange
microsoftasp.net_core*≥2.3.0  –  <2.3.6
microsoftasp.net_core*≥8.0.0  –  <8.0.21
microsoftasp.net_core*≥9.0.0  –  <9.0.10
microsoftvisual_studio_2022*≥17.10.0  –  <17.10.20
microsoftvisual_studio_2022*≥17.12.10  –  <17.12.13
microsoftvisual_studio_2022*≥17.14.0  –  <17.14.17

References 3

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.