5

CVE-2009-2521: microsoft internet_information_services Uncontrolled Resource Consumption

CVSS: 5.0v2.0MediumModified
Published 04-09-2009Last modified 07-08-2024
Open JSON

Vulnerability summary

CVE-2009-2521 is a medium (CVSS 5.0) Uncontrolled Resource Consumption vulnerability in microsoft internet_information_services. EPSS estimates a 82.27% chance of exploitation in the next 30 days, higher than 99.6% of scored vulnerabilities. 3 public exploits are recorded.

Overall risk
46/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.0/10
010
Medium · v2.0 (NVD)
EPSS score
82.27%
0%100%
Critical · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits3metasploit, exploit-database

Timeline

  1. 04-09-2009
    PublishedVulnerability first disclosed.
  2. 07-08-2024
    Last modifiedVulnerability information updated.

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."

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

82.27%

Chance of exploitation in the next 30 days

Percentile

100%

Versus all other CVEs

30-day change

0.00 pp

From 82.27% on 21-09-2026

21-09-202621-10-2026
EPSS score
82.27%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

3 found
  • MetasploitMetasploitremoteUnverified

    Microsoft IIS FTP Server LIST Stack Exhaustion

    auxiliary/dos/windows/ftp/iis_list_exhaustion

    Maturity: poc

  • exploit-databasedoswindowsVerified

    Microsoft IIS 5.0/6.0 FTP Server - Stack Exhaustion Denial of Service

    Maturity: poc

  • exploit-databasedoswindowsUnverified

    Microsoft IIS 7.0 FTP Server - Stack Exhaustion Denial of Service (MS09-053) (Metasploit)

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Microsoft1 product

1 vendor · 1 product

References

5 links