CVE-2004-0847 EXPLOIT
9.8
CRITICAL · CVSS 3.0 · EPSS 75.7% (pctl 100)
Patch early
A public exploit exists.
Description
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."
Scoring
| CVSS | 9.8 (CRITICAL, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 75.7% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-22 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2004-11-03 |
| Last modified | 2026-06-16 |
Affected (1)
| Vendor | Product |
|---|---|
| microsoft | asp.net |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Microsoft ASP.NET 1.x - URI Canonicalization Unauthorized Web Access | 2004-10-06 |
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
- 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
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