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CVE-2025-55315

ASP.NET Security Feature Bypass Vulnerability

Published: Oct 14, 2025Updated: Oct 28, 2025 Sources: CVE List NVD GHSA BDUCWE-444
NVD MITRE
9.9CVSSCRITICAL
EPSS Score
66.3%
Top 0.8%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:HA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-444

Affected Products

ASP.NET Core 2.3Microsoft
On-prem
Operating Systems / windows
ASP.NET Core 8.0Microsoft
On-prem
Operating Systems / windows
ASP.NET Core 9.0Microsoft
On-prem
Operating Systems / windows
Microsoft Visual Studio 2022 version 17.10Microsoft
Dev Tool
DevTools & CI / ide-editor
Microsoft Visual Studio 2022 version 17.12Microsoft
On-premDev Tool
DevTools & CI / ide-editor
microsoftcommercialUSOperating Systems
and 19 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315
msrc.microsoft.com
https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/
andrewlock.net
https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040
gist.github.com
and 13 more references View all →

Timeline

Published
Oct 14, 2025
Last Updated
Oct 28, 2025

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