CVE-2004-0847

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 75.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2004-11-03 · updated 2026-06-16
Weakness: CWE-22

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."

Affected products

Microsoft Corporation ASP.NET: through 1.1; 1.1-sp1

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

Get alerted when CVE-2004-0847 or the next vulnerability affects your stack