CVE-2004-1134

Microsoft w3who.dll - Buffer Overflow via Long Query String

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2004-1134. PoCs published by Metasploit, hdm, including Metasploit module exploits/windows/isapi/w3who_query.

AI-analyzed exploit summary This is a Metasploit module exploiting a stack buffer overflow in the w3who.dll ISAPI application (CVE-2004-1134). It targets Windows 2000 and XP by sending a maliciously crafted query string to trigger remote code execution.

Description

Buffer overflow in the Microsoft W3Who ISAPI (w3who.dll) allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long query string.

Exploits (2)

exploitdb WORKING POC VERIFIED
by Metasploit · rubyremotewindows
https://www.exploit-db.com/exploits/16354

This is a Metasploit module exploiting a stack buffer overflow in the w3who.dll ISAPI application (CVE-2004-1134). It targets Windows 2000 and XP by sending a maliciously crafted query string to trigger remote code execution.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft IIS with w3who.dll ISAPI extension
No auth needed
Prerequisites: Vulnerable IIS server with w3who.dll exposed · Network access to the target
devstral-2 · analyzed Feb 16, 2026 Full analysis →
metasploit WORKING POC GOOD
by hdm · rubypocwin
https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/isapi/w3who_query.rb

This Metasploit module exploits a stack buffer overflow in Microsoft IIS's w3who.dll ISAPI application (CVE-2004-1134). It targets Windows 2000 and XP by sending a maliciously crafted query string to trigger remote code execution.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft IIS with w3who.dll (Windows 2000/XP)
No auth needed
Prerequisites: Vulnerable IIS server with w3who.dll exposed · Network access to the target
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3
Core References
Mailing List mailing-list x_refsource_fulldisc
http://marc.info/?l=full-disclosure&m=110234486823233&w=2
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/18377

Scores

EPSS 0.7233
EPSS Percentile 99.4%

Details

Status published
Products (1)
microsoft/w3who.dll
Published Jan 10, 2005
Tracked Since Feb 18, 2026