CVE-2009-2521
Stack consumption vulnerability in the FTP Service in Microsoft Internet Information Services ...
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."
Exploit likelihood
What each source reports
NVD Score used
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."
- Record
CVE-2009-2521- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-400
- Updated
- 2026-11-02
CVE List No score
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."
- Record
CVE-2009-2521- Updated
- 2026-11-02
EUVDEUVD-2009-2516 No score
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."
- Record
EUVD-2009-2516- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-w8g4-h8cc-352m No score
Stack consumption vulnerability in the FTP Service in Microsoft Internet Information Services ...
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."
- Record
GHSA-w8g4-h8cc-352m- Weakness
- CWE-400
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Microsoft IIS 7.0 FTP Server - Stack Exhaustion Denial of Service (MS09-053) (Metasploit) | 2011-07-03 |
| Exploit-DB | Microsoft IIS 5.0/6.0 FTP Server - Stack Exhaustion Denial of Service | 2009-09-04 |
| Metasploit | Microsoft IIS FTP Server LIST Stack Exhaustion | 2009-09-03 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, Metasploit, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-2521 is a medium vulnerability (CVSS 5.0) in Microsoft Internet Information Services, published September 4, 2009. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 82.3%, the 99th percentile. No source names a fixed version.
References
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6508
support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ975191
us-cert.gov/cas/techalerts/TA09-286A.html
docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-053
archives.neohapsis.com/archives/fulldisclosure/2009-09/0040.html
nvd.nist.gov/vuln/detail/CVE-2009-2521
github.com/advisories/GHSA-w8g4-h8cc-352m