{
    "id": "CVE-2009-2521",
    "published": "2009-09-04 10:30:01",
    "last_modified": "2026-06-16 23:09:37",
    "cvss_score": "5.0",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
    "cwe": "CWE-400",
    "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.\"",
    "epss_score": "0.82265",
    "epss_percentile": "0.99650",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-26 18:16:46",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "microsoft",
            "product": "internet_information_services"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "17476",
            "title": "Microsoft IIS 7.0 FTP Server - Stack Exhaustion Denial of Service (MS09-053) (Metasploit)",
            "date": "2011-07-03",
            "url": "https://www.exploit-db.com/exploits/17476"
        },
        {
            "source": "exploit-db",
            "ref_id": "9587",
            "title": "Microsoft IIS 5.0/6.0 FTP Server - Stack Exhaustion Denial of Service",
            "date": "2009-09-04",
            "url": "https://www.exploit-db.com/exploits/9587"
        }
    ],
    "refs_list": [
        "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",
        "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"
    ]
}