CVE-2009-2521
MEDIUM · CVSS 5.0EPSS 82.3%EU EUVD
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."
Key facts
- CVSS score
- 5.0 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P- Weakness (CWE)
- CWE-400
- EPSS score
- 82.3% (100th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2009-2516)
- Published
- September 4, 2009
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2009-2516 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- microsoft / internet information services
References
- http://archives.neohapsis.com/archives/fulldisclosure/2009-09/0040.html(Broken Link)
- http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ975191
- http://www.us-cert.gov/cas/techalerts/TA09-286A.html(Third Party Advisory, US Government Resource)
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-053(Patch, Vendor Advisory)
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6508(Third Party Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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