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CVE-2010-3494

Concurrent Execution using Shared Resource with Improper Synchronization in pyftpdlib

4.3 MediumFix available

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Exploit likelihood

2.29%Up 0.1 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 4.3

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
CVE-2010-3494
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness
CWE-362
Updated
2026-11-02
CVE List No score

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
CVE-2010-3494
Updated
2026-11-02
EUVDEUVD-2010-0015 No score

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
EUVD-2010-0015
Updated
2026-11-03
GitHub AdvisoriesGHSA-hw4g-fhcp-x5mq 8.7

Concurrent Execution using Shared Resource with Improper Synchronization in pyftpdlib

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
GHSA-hw4g-fhcp-x5mq
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-362
Updated
2026-11-02
OSVGHSA-hw4g-fhcp-x5mq 8.7

Concurrent Execution using Shared Resource with Improper Synchronization in pyftpdlib

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
GHSA-hw4g-fhcp-x5mq
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-362
Updated
2026-11-02
OSV No score

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
CVE-2010-3494
Updated
2026-11-02
OSVDEBIAN-CVE-2010-3494 No score

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
DEBIAN-CVE-2010-3494
Updated
2026-11-02
OSVPYSEC-2010-11 No score

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
PYSEC-2010-11
Updated
2026-11-02
OSVUBUNTU-CVE-2010-3494 No score

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 accept function having an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Record
UBUNTU-CVE-2010-3494
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
pyftpdlib
PyPI
 before 0.5.2
0.5.2
python-pyftpdlib
Debian:12
 before 0.5.2-1
0.5.2-1
python-pyftpdlib
Debian:13
 before 0.5.2-1
0.5.2-1
python-pyftpdlib
Debian:14
 before 0.5.2-1
0.5.2-1
pyftpdlib
PyPI
 before 0.5.2, plus listed versions
0.2.00.3.00.4.00.5.00.5.1
0.5.2
python-pyftpdlib
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.2.0-11.4.0-1
 None known
python-pyftpdlib
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.5.1-4ubuntu1
 None known
python-pyftpdlib
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.5.4-11.5.4-2build1
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2010-3494 is a medium vulnerability (CVSS 4.3) in G.rodola Pyftpdlib, published October 19, 2010. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.29%, the 83rd percentile. Fixed in pyftpdlib 0.5.2.

References

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