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CVE-2004-0847

CriticalPublished

The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories...

Published: Oct 6, 2004
Updated: Aug 8, 2024
Assigning CNA: mitre
Evidence observed: Oct 6, 2004

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.0

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

71.5%

High · next 30 days

Percentile: 99.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a request containing a (1) "\" (backslash) or (2) "%5C" (encoded backslash), aka "Path Validation Vulnerability."

Sources

Microsoft ASP.NET 1.x - URI Canonicalization Unauthorized Web AccessExploit
anonymous · asp · Oct 6, 2004

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