Serv-U FTP Server 3.0/3.1/4.0.0.4 Connection MKD input validation

HistoryDiffrelatejsonxmlCTI

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 (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Serv-U FTP Server 3.0/3.1/4.0.0.4. This issue affects some unknown processing of the component Connection Handler. This manipulation of the argument MKD causes input validation. This vulnerability is registered as CVE-2002-2393. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in Serv-U FTP Server 3.0/3.1/4.0.0.4 (File Transfer Software). Affected by this vulnerability is an unknown functionality of the component Connection Handler. The manipulation of the argument MKD with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

Serv-U FTP server 3.0, 3.1 and 4.0.0.4 does not accept new connections while validating user folder access rights, which allows remote attackers to cause a denial of service (no new connections) via a series of MKD commands.

The weakness was published 12/31/2002 by Matt Thompson (Paul) (Website). It is possible to read the advisory at archives.neohapsis.com. This vulnerability is known as CVE-2002-2393 since 10/31/2007. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 27238 (RhinoSoft Serv-U FTP Server Denial of Service Vulnerability).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (10573) and SecurityFocus (BID 6112†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

File Transfer Software

Vendor

Serv-U

Name

FTP Server

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

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

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/06/2002 🔍
12/31/2002 +55 days 🔍
12/31/2002 +0 days 🔍
10/31/2007 +1765 days 🔍
08/07/2014 +2472 days 🔍
08/26/2025 +4037 days 🔍

Sourcesinfo

Advisory: archives.neohapsis.com
Researcher: Matt Thompson (Paul)
Status: Not defined

CVE: CVE-2002-2393 (🔍)
GCVE (CVE): GCVE-0-2002-2393
GCVE (VulDB): GCVE-100-20035
X-Force: 10573
SecurityFocus: 6112 - RhinoSoft Serv-U FTP Server Denial Of Service Vulnerability

Entryinfo

Created: 08/07/2014 14:39
Updated: 08/26/2025 17:54
Changes: 08/07/2014 14:39 (53), 04/20/2019 17:09 (1), 07/14/2024 15:16 (17), 08/26/2025 17:54 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.