Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in pyftpdlib
Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.1 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 return value of None, a different vulnerability than CVE-2010-3494.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | pyftpdlib | < 0.5.1 | 0.5.1 |
References
- http://code.google.com/p/pyftpdlib/source/detail?r=439
- https://bugs.launchpad.net/zodb/+bug/135108
- http://www.openwall.com/lists/oss-security/2010/09/24/3
- http://code.google.com/p/pyftpdlib/issues/detail?id=91
- http://code.google.com/p/pyftpdlib/source/diff?spec=svn439&r=439&format=side&path=/trunk/pyftpdlib/ftpserver.py
- http://bugs.python.org/issue6706
- http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY
- http://www.openwall.com/lists/oss-security/2010/09/09/6
- http://www.openwall.com/lists/oss-security/2010/09/22/3
- http://www.openwall.com/lists/oss-security/2010/09/11/2
- https://github.com/advisories/GHSA-mpg6-rgp4-35rr
- https://nvd.nist.gov/vuln/detail/CVE-2009-5010
- https://github.com/giampaolo/pyftpdlib
- https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-7.yaml
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-362- Platform
- Python (PyPI)
- Package
pyftpdlib- Disclosed
- 19.10.2010
- Updated
- 11.10.2026 11:20
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2010-7 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-mpg6-rgp4-35rr - CC BY 4.0
Vulnerability history: pyftpdlib
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 10.2010 10.2010
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 9
Disclosures per year
- 2017: 0
- 2018: 0
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
earlier: 14
-
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in pyftpdlib this entry
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