CVE-2004-0847
The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass...
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."
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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."
- Record
CVE-2004-0847- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-22
- Updated
- 2026-11-02
CVE List No score
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."
- Record
CVE-2004-0847- Updated
- 2026-11-02
EUVDEUVD-2004-0845 No score
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."
- Record
EUVD-2004-0845- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wxfc-g96x-mm56
The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass...
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."
- Record
GHSA-wxfc-g96x-mm56- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-22
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Microsoft ASP.NET 1.x - URI Canonicalization Unauthorized Web Access | 2004-10-06 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2004-0847 is a critical vulnerability (CVSS 9.8) in Microsoft Asp.net, published October 6, 2004. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 75.7%, the 99th percentile. No source names a fixed version.
References
docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-004
sourceforge.net/mailarchive/forum.php?thread_id=5671607&forum_id=24754
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4987
us-cert.gov/cas/techalerts/TA05-039A.html
exchange.xforce.ibmcloud.com/vulnerabilities/17644