CVE DATABASE / CVE-2004-0847
CVE-2004-0847
CVSS 9.8 · CRITICAL
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."
CVSS 3.0 breakdown
| Base score | 9.8 (CRITICAL) |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Microsoft asp.net
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References
- http://archives.neohapsis.com/archives/ntbugtraq/2004-q3/0221.html
- http://sourceforge.net/mailarchive/forum.php?thread_id=5671607&forum_id=24754
- http://www.kb.cert.org/vuls/id/283646
- http://www.securityfocus.com/bid/11342
- http://www.us-cert.gov/cas/techalerts/TA05-039A.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-004
- https://exchange.xforce.ibmcloud.com/vulnerabilities/17644
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A3556
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4987
Data: NIST NVD. NVD last modified 2026-04-16. Always verify against the vendor advisory before acting.