Microsoft IIS 4.0/5.0 File Extension denial of service

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Microsoft IIS 4.0/5.0. This affects an unknown function of the component File Extension Handler. The manipulation results in denial of service. This vulnerability is known as CVE-2000-0408. Furthermore, an exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Microsoft IIS 4.0/5.0 (Web Server). It has been classified as problematic. Affected is an unknown function of the component File Extension Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

IIS 4.05 and 5.0 allow remote attackers to cause a denial of service via a long, complex URL that appears to contain a large number of file extensions, aka the "Malformed Extension Data in URL" vulnerability.

The weakness was published 05/11/2000 by Ussr Labs with Microsoft as MS00-030 as confirmed bulletin (Technet). The advisory is shared for download at microsoft.com. This vulnerability is traded as CVE-2000-0408. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but a public exploit is available.

A public exploit has been developed in Windows Binary. The exploit is shared for download at securityfocus.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 10406 (Microsoft IIS Malformed File Extension URL DoS), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 86158 (Microsoft IIS 4.0/5.0 Malformed File Extension Denial of Service Vulnerability).

Applying the patch MS00-030 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 2304.

The vulnerability is also documented in the databases at X-Force (4430), Exploit-DB (19907), Tenable (10406), SecurityFocus (BID 1190†) and Vulnerability Center (SBV-133†). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

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Nessus ID: 10406
Nessus Name: Microsoft IIS Malformed File Extension URL DoS
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800950
OpenVAS Name: Microsoft IIS Malformed File Extension Denial of Service Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: MS00-030
TippingPoint: 🔍
ISS Proventia IPS: 🔍

Timelineinfo

05/11/2000 🔍
05/11/2000 +0 days 🔍
05/11/2000 +0 days 🔍
05/11/2000 +0 days 🔍
05/12/2000 +1 days 🔍
10/15/2002 +886 days 🔍
06/24/2014 +4270 days 🔍
10/16/2025 +4132 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MS00-030
Researcher: Ussr Labs
Organization: Microsoft
Status: Confirmed

CVE: CVE-2000-0408 (🔍)
GCVE (CVE): GCVE-0-2000-0408
GCVE (VulDB): GCVE-100-15540
X-Force: 4430
SecurityFocus: 1190 - Microsoft IIS 4.0/5.0 Malformed File Extension DoS Vulnerability
Vulnerability Center: 133 - [MS00-030] IIS 4/5 DOS malformed data, High

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/24/2014 16:25
Updated: 10/16/2025 08:38
Changes: 06/24/2014 16:25 (79), 05/05/2019 09:12 (2), 02/16/2025 21:12 (17), 10/16/2025 08:38 (2)
Complete: 🔍
Cache ID: 216::103

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