CVE-2009-5011

4.3 MEDIUM 0.9% exploit odds No fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 0.9% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2010-10-19 20:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:14 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.9% in the next 30 days (EPSS).
Severity: 4.3 MEDIUM (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2010-10-19 20:00 UTC
Last modified: 2026-06-16 23:14 UTC
Exploit probability: 0.9% · EPSS, next 30 days
Weakness: CWE-362 · Race condition
Record status: Modified

Affected

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

Attack profile CVSS 2.0 · 4.3

Attack vector: Network
Complexity: Medium
Authentication: None
Confidentiality: None
Integrity: None
Availability: Partial

Raw vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

Is it in your code?

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References

NVD record · CVE.org record