CRITICAL 9.9 Microsoft PoC
CVE-2025-55315
ASP.NET Security Feature Bypass Vulnerability
Microsoft Security Update 2025-Oct: ASP.NET Security Feature Bypass Vulnerability
Affected Products
- ASP.NET Core 8.0
- ASP.NET Core 9.0
- ASP.NET Core 2.3
- Microsoft Visual Studio 2022 version 17.12
- Microsoft Visual Studio 2022 version 17.10
- Microsoft Visual Studio 2022 version 17.14
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315
- https://nvd.nist.gov/vuln/detail/CVE-2025-55315
This critical severity vulnerability with a CVSS score of 9.9 was published on 2025-10-14 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. EPSS score: 65.9% (top 1% of all CVEs by exploitation probability). Affected: ASP.NET Core 8.0, ASP.NET Core 9.0, ASP.NET Core 2.3 and 3 more.
Risk Timeline
CVE Disclosed2025-10-14 · 344 days ago
Public PoC Exploit AvailableWeaponised proof-of-concept code is publicly accessible
Remediation Resources
Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2025-55315Related Vulnerabilities
| CVE | Title | Severity | CVSS |
|---|---|---|---|
| CVE-2026-40372 | ASP.NET Core Elevation of Privilege Vulnerability | CRITICAL | 9.1 |
| CVE-2025-26682 | ASP.NET Core and Visual Studio Denial of Service Vulnerability | HIGH | 7.5 |
| CVE-2024-21386 | .NET Denial of Service Vulnerability | HIGH | 7.5 |
| CVE-2026-69304 | ASP.NET Core Denial of Service Vulnerability | MEDIUM | 5.9 |
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