ZeroDay Findings
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2004-0847

Microsoft asp.net Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Published Feb 8, 2005 · catalog updated Feb 8, 2005 · Microsoft

Patch now

CVE-2004-0847 is in the CISA known-exploited catalog. Confirm Microsoft against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
75.70%
Remediation
Remediation guidance
Affected products
vendor Microsoft asp.net

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."

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft asp.netversion unspecified

How to fix CVE-2004-0847

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2004-0847 is in the CISA known-exploited catalog. Confirm Microsoft against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 75.70%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 8, 2005 · VulnCheck KEV

    Detected

    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."

  2. Feb 8, 2005 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2004-0847

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2004-0847

    30-day exploitation probability 75.7%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2004-0847

    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."

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.