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Servers and applications

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."

Severity
Medium 5.0
Published
4 Sept 2009
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
82% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Uncontrolled resource consumption (CWE-400)
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
Microsoft IISServers and applications · cpe:a:microsoft:internet_information_services
  • From 5.0 up to 7.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2009-2521
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2009-2521