CVE-2009-5011

Name: CVE-2009-5011
Creator: NVD / NIST
Published: 2010-10-19T20:00:03.017+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.93%

Last modified Jun 16, 2026

CVE-2009-5011 is a vulnerability of currently unknown severity. Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.2 allows remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the getpeername function having an ENOTCONN error, a different vulnerability than CVE-2010-3494.. EPSS estimates a 0.93% chance of exploitation in the next 30 days.

Description

Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.2 allows remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the getpeername function having an ENOTCONN error, a different vulnerability than CVE-2010-3494.

Metrics

EPSS Probability

0.93%

56.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-362

Affected Software

Vendor	Product	Versions
G.Rodola	Pyftpdlib	<= 0.5.1
G.Rodola	Pyftpdlib	0.1
G.Rodola	Pyftpdlib	0.1.1
G.Rodola	Pyftpdlib	0.2.0
G.Rodola	Pyftpdlib	0.3.0
G.Rodola	Pyftpdlib	0.4.0
G.Rodola	Pyftpdlib	0.5.0

References

Timeline

Published: Oct 19, 2010
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-5011?

How severe is CVE-2009-5011?

Severity scoring for CVE-2009-5011 is pending analysis. The EPSS model estimates a 0.93% probability of exploitation in the next 30 days.

How do I fix CVE-2009-5011?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-5011?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST