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Critical ASP.NET Vulnerability Allows Attacker To Bypass Security Feature Remotely

On October 14, 2025, Microsoft disclosed a critical vulnerability identified in ASP.NET Core, tracked as CVE-2025-55315 . This vulnerability allows authenticated attackers to perform HTTP request smuggling, potentially bypassing important security…

EBy Eric WallaceOct 21, 20251 min read

On October 14, 2025, Microsoft disclosed a critical vulnerability identified in ASP.NET Core, tracked as CVE-2025-55315 . This vulnerability allows authenticated attackers to perform HTTP request smuggling, potentially bypassing important security measures.

The vulnerability is caused by inconsistent handling of HTTP requests, classified under CWE-444. This flaw allows attackers to inject malicious payloads by exploiting the misinterpretation of HTTP requests by servers.

An attacker with low-level privileges can craft requests that bypass front-end security controls, such as web application firewalls. This could lead to session hijacking, credential theft, or unauthorized server file modifications. The vulnerability, with a CVSS v3.1 base score of 9.9, poses significant risks to system confidentiality, integrity, and availability.

This issue impacts developers utilizing ASP.NET Core in .NET 8 and subsequent versions, as well as older .NET 2.3 systems using the Kestrel server. Although there is no current evidence of active exploitation, Microsoft has released an official fix to address this vulnerability.

On October 14, 2025, Microsoft disclosed a critical vulnerability identified in ASP.NET Core, tracked as CVE-2025-55315 .
Eric Wallace · Thehackingpost

Developers using .NET 8 or later should apply the latest Microsoft Update and restart applications to mitigate this vulnerability. For .NET 2.3, it is advised to update the Microsoft.AspNetCore.Server.Kestrel.Core package to version 2.3.6, recompile, and redeploy applications. Additional remediation measures include auditing HTTP parsing in custom middleware and enforcing strict request validation.

Organizations are urged to scan for vulnerable deployments and monitor logs for unusual requests, as unpatched systems could lead to data breaches or compliance issues.

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Security teams should integrate this update into their vulnerability management workflows, considering the widespread use of ASP.NET Core in enterprise environments. Prompt action is critical to safeguard systems against potential exploitation.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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