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CVE-2004-0847

Published: Oct 6, 2004Updated: Apr 16, 2026 Sources: CVE List NVDCWE-22
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
75.7%
Top 0.5%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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."

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-22

Affected Products

n/an/a
asp.netmicrosoft
On-prem
Operating Systems / windows
microsoftcommercialUSOperating Systems

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-004
docs.microsoft.com
http://sourceforge.net/mailarchive/forum.php?thread_id=5671607&forum_id=24754
sourceforge.net
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4987
oval.cisecurity.org
and 6 more references View all →

Timeline

Published
Oct 6, 2004
Last Updated
Apr 16, 2026

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