{"cve":"CVE-2009-2521","nvd":{"published":"2009-09-04T10:30:01.907","modified":"2026-06-16T23:09:37.800","status":"Modified","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.\"","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-400"],"references":["http://archives.neohapsis.com/archives/fulldisclosure/2009-09/0040.html","http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ975191","http://www.us-cert.gov/cas/techalerts/TA09-286A.html","https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-053","https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6508"],"products":["microsoft:internet_information_services"],"source":"nvd","synced_at":"2026-10-19T19:54:26.868835795+00:00"},"epss":{"cve":"CVE-2009-2521","score":0.82265,"percentile":0.99659,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}