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CVE-2004-0847
CRITICAL
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."
Published: Nov 3, 2004
Modified: Jun 16, 2026
CWE-22
CVSS Metrics
CVSSv3
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products (2)
| Vendor | Product | Version |
|---|---|---|
| microsoft | asp.net | * |
| microsoft | asp.net | 1.1 |
GitHub Security Advisory GHSA-wxfc-g96x-mm56
The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass...
References (18)
- http://archives.neohapsis.com/archives/ntbugtraq/2004-q3/0221.html Exploit, Vendor Advisory
- http://sourceforge.net/mailarchive/forum.php?thread_id=5671607&forum_id=24754 Broken Link
- http://www.kb.cert.org/vuls/id/283646 Third Party Advisory, US Government Resource
- http://www.securityfocus.com/bid/11342 Third Party Advisory, VDB Entry
- http://www.us-cert.gov/cas/techalerts/TA05-039A.html Third Party Advisory, US Government Resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-004
- https://exchange.xforce.ibmcloud.com/vulnerabilities/17644 Third Party Advisory, VDB Entry
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A3556 Third Party Advisory
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4987 Third Party Advisory
- http://archives.neohapsis.com/archives/ntbugtraq/2004-q3/0221.html Exploit, Vendor Advisory
- http://sourceforge.net/mailarchive/forum.php?thread_id=5671607&forum_id=24754 Broken Link
- http://www.kb.cert.org/vuls/id/283646 Third Party Advisory, US Government Resource
- http://www.securityfocus.com/bid/11342 Third Party Advisory, VDB Entry
- http://www.us-cert.gov/cas/techalerts/TA05-039A.html Third Party Advisory, US Government Resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-004
Risk Scores
CVSS Score
9.8 / 10
EPSS Score
75.70%
Top 1% most likely to be exploited
Threat Score
71.9 / 100
Data Sources
NVD
EPSS
GitHub