Microsoft Internet Information Server 4.0/5.0 FTP Service User information disclosure

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Microsoft Internet Information Server 4.0/5.0. The impacted element is an unknown function of the component FTP Service. This manipulation causes information disclosure (User). This vulnerability is tracked as CVE-2001-0335. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Microsoft Internet Information Server 4.0/5.0 (Web Server). It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component FTP Service. The manipulation with an unknown input leads to a information disclosure vulnerability (User). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

FTP service in IIS 5.0 and earlier allows remote attackers to enumerate Guest accounts in trusted domains by preceding the username with a special sequence of characters.

The weakness was disclosed 06/27/2001 with Microsoft as MS01-026 as confirmed bulletin (Technet). The advisory is shared at microsoft.com. This vulnerability is known as CVE-2001-0335. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 27163 (Microsoft IIS Various Domain User Account Access Vulnerability (MS01-026)).

Applying the patch MS01-026 is able to eliminate this problem. The bugfix is ready for download at microsoft.com.

The vulnerability is also documented in the databases at X-Force (6545), SecurityFocus (BID 2719†) and Vulnerability Center (SBV-3340†). The entries VDB-16836, VDB-16838 and VDB-16839 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: User
Class: Information disclosure / User
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: MS01-026

Timelineinfo

05/14/2001 🔍
06/27/2001 +44 days 🔍
06/27/2001 +0 days 🔍
06/27/2001 +0 days 🔍
01/06/2004 +923 days 🔍
07/04/2014 +3832 days 🔍
10/07/2025 +4113 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MS01-026
Organization: Microsoft
Status: Confirmed

CVE: CVE-2001-0335 (🔍)
GCVE (CVE): GCVE-0-2001-0335
GCVE (VulDB): GCVE-100-16837
X-Force: 6545 - Microsoft IIS FTP weak domain authentication
SecurityFocus: 2719 - Microsoft IIS Various Domain User Account Access Vulnerability
Vulnerability Center: 3340 - [MS01-026] FTP service in IIS 5.0 Allows Access to the Domain, High

See also: 🔍

Entryinfo

Created: 07/04/2014 16:20
Updated: 10/07/2025 05:07
Changes: 07/04/2014 16:20 (45), 05/19/2019 07:14 (22), 10/07/2025 05:07 (18)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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