How severe is CVE-2009-5011?

CVE-2009-5011 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-5011 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-5011?

CVE-2009-5011 primarily affects G.rodola Pyftpdlib. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-5011?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-5011 published?

CVE-2009-5011 was published on 2010-10-19 and last updated on 2026-06-16.

CVE-2009-5011

CVE-2009-5011 is a medium-severity vulnerability in G.rodola Pyftpdlib with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-362
Affected product: G.rodola Pyftpdlib
Published: 2010-10-19
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2009-5011?: 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.
How severe is CVE-2009-5011?: CVE-2009-5011 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2009-5011 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-5011?: CVE-2009-5011 primarily affects G.rodola Pyftpdlib. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-5011?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-5011 published?: CVE-2009-5011 was published on 2010-10-19 and last updated on 2026-06-16.

References

Affected products (7)

cpe:2.3:a:g.rodola:pyftpdlib:*:*:*:*:*:*:*:*
cpe:2.3:a:g.rodola:pyftpdlib:0.1:*:*:*:*:*:*:*
cpe:2.3:a:g.rodola:pyftpdlib:0.1.1:*:*:*:*:*:*:*
cpe:2.3:a:g.rodola:pyftpdlib:0.2.0:*:*:*:*:*:*:*
cpe:2.3:a:g.rodola:pyftpdlib:0.3.0:*:*:*:*:*:*:*
cpe:2.3:a:g.rodola:pyftpdlib:0.4.0:*:*:*:*:*:*:*
cpe:2.3:a:g.rodola:pyftpdlib:0.5.0:*:*:*:*:*:*:*

More vulnerabilities in G.rodola Pyftpdlib

CVE-2008-7263 — High (CVSS 7.5): ftpserver.py in pyftpdlib before 0.5.0 does not delay its response after receiving an invalid login attempt, which…
CVE-2007-6737 — High (CVSS 7.5): FTPServer.py in pyftpdlib before 0.2.0 does not increment the attempted_logins count for a USER command that specifies…
CVE-2008-7262 — Medium (CVSS 6.5): Multiple directory traversal vulnerabilities in FTPServer.py in pyftpdlib before 0.3.0 allow remote authenticated users…
CVE-2007-6741 — Medium (CVSS 6.5): The ftp_PORT function in FTPServer.py in pyftpdlib before 0.2.0 does not prevent TCP connections to privileged ports if…
CVE-2007-6736 — Medium (CVSS 6.5): Multiple directory traversal vulnerabilities in FTPServer.py in pyftpdlib before 0.2.0 allow remote authenticated users…
CVE-2007-6739 — Medium (CVSS 5.0): FTPServer.py in pyftpdlib before 0.2.0 allows remote attackers to cause a denial of service via a long command.

All CVEs affecting G.rodola Pyftpdlib →

Other CWE-362 (Race Condition) vulnerabilities

CVE-2022-27626 — Critical (CVSS 10.0): A vulnerability regarding concurrent execution using shared resource with improper synchronization ('Race Condition')…
CVE-2015-8556 — Critical (CVSS 10.0): Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
CVE-2014-0703 — Critical (CVSS 10.0): Cisco Wireless LAN Controller (WLC) devices 7.4 before 7.4.110.0 distribute Aironet IOS software with a race condition…
CVE-2010-1228 — Critical (CVSS 10.0): Multiple race conditions in the sandbox infrastructure in Google Chrome before 4.1.249.1036 have unspecified impact and…
CVE-2008-6598 — Critical (CVSS 10.0): Multiple race conditions in WANPIPE before 3.3.6 have unknown impact and attack vectors related to "bri restart logic."
CVE-2026-46137 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: fix potential…

Browse all CWE-362 (Race Condition) vulnerabilities →