CVE-2009-2521

Microsoft IIS 5.0/6.0 FTP Server - Stack Exhaustion Denial of Service

Severity Score

6.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Stack consumption vulnerability in the FTP Service in Microsoft Internet Information Services (IIS) 5.0 through 7.0 allows remote authenticated users to cause a denial of service (daemon crash) via a list (ls) -R command containing a wildcard that references a subdirectory, followed by a .. (dot dot), aka "IIS FTP Service DoS Vulnerability."

Una vulnerabilidad de consumo de pila en el Servicio FTP en Internet Information Services (IIS) de Microsoft versiones 5.0 hasta 7.0, permite a los usuarios autenticados remotos causar una denegación de servicio (bloqueo del demonio) por medio de un comando list (ls) -R que contiene un comodín que hace referencia a un subdirectorio, seguido por un .. (punto punto), también se conoce como "IIS FTP Service DoS Vulnerability".

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2009-07-17 CVE Reserved
2009-09-04 CVE Published
2009-09-04 First Exploit
2024-08-07 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (8)

URL	Tag	Source
http://archives.neohapsis.com/archives/fulldisclosure/2009-09/0040.html	Broken Link
http://www.us-cert.gov/cas/techalerts/TA09-286A.html	Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6508	Signature

URL	Date	SRC
https://packetstorm.news/files/id/180573	2024-08-31
https://www.exploit-db.com/exploits/9587	2009-09-04
https://www.exploit-db.com/exploits/17476	2011-07-03

URL	Date	SRC
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-053	2023-11-07

URL	Date	SRC
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ975191	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Microsoft Search vendor "Microsoft"		Internet Information Services Search vendor "Microsoft" for product "Internet Information Services"				>= 5.0 <= 7.0 Search vendor "Microsoft" for product "Internet Information Services" and version " >= 5.0 <= 7.0"		-		Affected