Which products and versions are affected by CVE-2004-1134?

Affected: W3who.dll (Microsoft). The full list is in the CVE brief.

Is CVE-2004-1134 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2004-1134 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2004-1134?

Public exploit code is available.

Is there a fix for CVE-2004-1134?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2004-1134 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2004-1134

CriticalPublic exploit

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.

Published Jan 10, 2005 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2004-1134 is a critical-severity vulnerability (CVSS 10.0 v2) affecting W3who.dll (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 72% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

10.0

AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

72%

Higher than 99.4% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2004-1134 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
W3who.dllMicrosoft	See advisory	n/a

Timeline

Publicly disclosed
Jan 10, 2005
Last updated
Apr 15, 2026

References

exploitMSF w3who_query.rb
exploitExploitDB-16354
other20041206 Multiple vulnerabilities in w3who ISAPI DLL
otherw3who-bo(18377)
otherhttp://www.exaprobe.com/labs/advisories/esa-2004-1206.html

FAQ

Common Questions.

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.
Affected: W3who.dll (Microsoft). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2004-1134 Running On Your Attack Surface?

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