CVE-2004-0847

9.8 criticalEPSS 76%

Critical (9.8) in microsoft asp.net. EPSS 76% chance of exploitation in the next 30 days.

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."

Severity

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

EPSS: 76% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-11-01)
CWE: CWE-22
Published: 2004-11-03
Modified: 2026-06-16
Record from: the NVD, synced 2026-10-19

Affected

microsoft:asp.net

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

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