Resource exhaustion in Microsoft Internet Information Services
CVE-2009-2521
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."
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v2 metric
CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.823 (99.7th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.823 · newest: 0.823 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:6508 (signature, Third Party Advisory, vdb-entry)
- support.microsoft.com/default.aspx (vendor-advisory)
- www.us-cert.gov/cas/techalerts/TA09-286A.html (US Government Resource, Third Party Advisory, third-party-advisory)
- docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-053 (vendor-advisory, Patch, Vendor Advisory)
- archives.neohapsis.com/archives/fulldisclosure/2009-09/0040.html (mailing-list, Broken Link)
Frequently asked questions
- What is CVE-2009-2521?
- CVE-2009-2521 is a vulnerability in Microsoft Internet Information Services, classified under Uncontrolled Resource Consumption. Published 2009-09-04.
- Is CVE-2009-2521 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.