{"id":"CVE-2009-5010","aliases":["EUVD-2010-0025","GHSA-mpg6-rgp4-35rr","PYSEC-2010-7"],"status":"published","title":"Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in pyftpdlib","description":"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.","severity":{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01364,"percentile":0.72,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-362"],"published":"2010-10-19T19:00:00Z","modified":"2026-06-16T23:14:49Z","fixes":[{"ecosystem":"PyPI","package":"pyftpdlib","fixed_in":["0.5.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.5.0"},{"fixed":"0.5.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.1"}]}],"versions":["0.2.0","0.3.0","0.4.0","0.5.0"]},{"source":"osv","ecosystem":"PyPI","package":"pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.1"}]}],"versions":["0.2.0","0.3.0","0.4.0","0.5.0"]}],"products":[{"vendor":"g.rodola","product":"pyftpdlib"}],"references":[{"url":"http://www.openwall.com/lists/oss-security/2010/09/11/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://code.google.com/p/pyftpdlib/issues/detail?id=91","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"https://bugs.launchpad.net/zodb/+bug/135108","tags":["x_refsource_MISC","x_transferred","web"]},{"url":"http://code.google.com/p/pyftpdlib/source/detail?r=439","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://www.openwall.com/lists/oss-security/2010/09/24/3","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://www.openwall.com/lists/oss-security/2010/09/22/3","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://bugs.python.org/issue6706","tags":["x_refsource_MISC","x_transferred","Patch","web"]},{"url":"http://www.openwall.com/lists/oss-security/2010/09/09/6","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://code.google.com/p/pyftpdlib/source/diff?spec=svn439\u0026r=439\u0026format=side\u0026path=/trunk/pyftpdlib/ftpserver.py","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-5010","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-7.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-mpg6-rgp4-35rr","tags":["advisory"]},{"url":"https://github.com/giampaolo/pyftpdlib","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2009-5010","description":"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.","status":"published","published":"2010-10-19T19:00:00Z","modified":"2024-09-16T16:59:08.586Z","updated_at":"2026-11-02T14:33:22.699876Z"}],"euvd":[{"id":"EUVD-2010-0025","description":"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.","status":"published","published":"2010-10-19T19:00:00Z","modified":"2024-09-16T16:59:08Z","updated_at":"2026-11-03T00:55:46.200652Z"}],"ghsa":[{"id":"GHSA-mpg6-rgp4-35rr","title":"Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in pyftpdlib","description":"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.","status":"published","published":"2022-05-02T04:00:27Z","modified":"2024-10-14T17:00:43Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:38:10.696798Z"}],"nvd":[{"id":"CVE-2009-5010","description":"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.","status":"published","published":"2010-10-19T20:00:02.957Z","modified":"2026-06-16T23:14:49.287Z","cvss":[{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:01:38.684719Z"}],"osv":[{"id":"GHSA-mpg6-rgp4-35rr","title":"Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in pyftpdlib","description":"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.","status":"published","published":"2022-05-02T04:00:27Z","modified":"2024-10-14T18:37:45.677572Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T15:46:52.170928Z"},{"id":"PYSEC-2010-7","description":"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.","status":"published","published":"2010-10-19T20:00:00Z","modified":"2023-11-08T03:56:54.553892Z","updated_at":"2026-11-02T15:52:51.254177Z"}]}}