Unrated severityNVD Advisory· Published Sep 4, 2009· Updated Jun 16, 2026
CVE-2009-2521
CVE-2009-2521
Description
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."
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2cpe:2.3:a:microsoft:internet_information_services:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:microsoft:internet_information_services:*:*:*:*:*:*:*:*range: >=5.0,<=7.0
- (no CPE)range: 5.0 through 7.0
Patches
Vulnerability mechanics
References
5- docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-053nvdPatchVendor Advisory
- www.us-cert.gov/cas/techalerts/TA09-286A.htmlnvdThird Party AdvisoryUS Government Resource
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6508nvdThird Party Advisory
- archives.neohapsis.com/archives/fulldisclosure/2009-09/0040.htmlnvdBroken Link
- support.microsoft.com/default.aspxnvd
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