CVE-2009-2521 json
Stack consumption vulnerability in the FTP Service in Microsoft Internet Information Services (IIS) 5.0 through 7.0 allows remote authentic…
published 2009-09-04 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2516
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 82.3%
- EPSS 82.3% chance of exploitation in 30 days, percentile 99.6%
- public exploits
- 3
- Metasploit, Exploit-DB
Summary
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."
Patch / fix
Timeline
- First public exploit (Metasploit auxiliary/dos/windows/ftp/iis_list_exhaustion)
- Published
Exploit prediction
82.27% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit auxiliary/dos/windows/ftp/iis_list_exhaustion Microsoft IIS FTP Server LIST Stack Exhaustion metasploit auxiliary, normal rank, 2009-09-03
- EDB-17476 Microsoft IIS 7.0 FTP Server - Stack Exhaustion Denial of Service (MS09-053) (Metasploit) dos, 2011-07-03
- EDB-9587 Microsoft IIS 5.0/6.0 FTP Server - Stack Exhaustion Denial of Service dos, 2009-09-04
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
docs.microsoft.com
/en-us/security-updates/securitybulletins/2009/ms09-053
vendor-advisory, patch
-
support.microsoft.com
/default.aspx?scid=kb%3B%5BLN%5D%3BQ975191
vendor-advisory
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6508
vdb-entry, signature, third-party-advisory
-
us-cert.gov
/cas/techalerts/TA09-286A.html
third-party-advisory, us-government-resource
-
archives.neohapsis.com
/archives/fulldisclosure/2009-09/0040.html
mailing-list, broken-link
Sources
- CVE List CVE-2009-2521
- NVD CVE-2009-2521
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.