CVE-2009-2521 EXPLOIT
5.0
MEDIUM · CVSS 2.0 · EPSS 82.3% (pctl 100)
Patch early
A public exploit exists.
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."
Scoring
| CVSS | 5.0 (MEDIUM, v2.0) |
|---|---|
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| EPSS | 82.27% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-400 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2009-09-04 |
| Last modified | 2026-06-16 |
Affected (1)
| Vendor | Product |
|---|---|
| microsoft | internet information services |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Microsoft IIS 7.0 FTP Server - Stack Exhaustion Denial of Service (MS09-053) (Metasploit) | 2011-07-03 |
| exploit-db | Microsoft IIS 5.0/6.0 FTP Server - Stack Exhaustion Denial of Service | 2009-09-04 |
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
- 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
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