CVE-2025-55315

ASP.NET Security Feature Bypass Vulnerability

Published Oct 14, 2025 CVSS 3.1 · 9.9 Critical EPSS 67.2% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-5rrx-jjjq-q2r5 Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability
Ubuntu USN Ubuntu USN USN-7822-1 .NET vulnerabilities
History
Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Microsoft visual Studio
Vendors & Products Microsoft visual Studio
Type Values Removed Values Added
First Time appeared Microsoft
Microsoft asp.net Core
Microsoft visual Studio 2022
CPEs cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft asp.net Core
Microsoft visual Studio 2022
Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:10.0
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics threat_severity

None

threat_severity

Important

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title ASP.NET Security Feature Bypass Vulnerability
Weaknesses CWE-444
References
Metrics cvssV3_1

{'score': 9.9, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Feb 22, 2026, 5:24 PM
Reserved
Aug 12, 2025, 8:19 PM
Status
Modified
Published
Oct 14, 2025, 5:15 PM
Modified
Oct 18, 2026, 9:10 PM
Severity
Important
Public date
Oct 15, 2025, 12:58 PM