{"id":"CVE-2009-5011","aliases":["DEBIAN-CVE-2009-5011","EUVD-2010-0026","GHSA-62xg-239j-vxg7","PYSEC-2010-8"],"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 0.5.2 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.","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":0.00916,"percentile":0.60442,"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":"2026-10-23T17:47:25Z","fixes":[{"ecosystem":"PyPI","package":"pyftpdlib","fixed_in":["0.5.2"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"python-pyftpdlib","fixed_in":["0.5.2-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"python-pyftpdlib","fixed_in":["0.5.2-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"python-pyftpdlib","fixed_in":["0.5.2-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.5.1"},{"fixed":"0.5.2"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"python-pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.2-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"python-pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.2-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"python-pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.2-1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.2"}]}],"versions":["0.2.0","0.3.0","0.4.0","0.5.0","0.5.1"]},{"source":"osv","ecosystem":"PyPI","package":"pyftpdlib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.2"}]}],"versions":["0.2.0","0.3.0","0.4.0","0.5.0","0.5.1"]}],"products":[{"vendor":"g.rodola","product":"pyftpdlib"}],"references":[{"url":"http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://code.google.com/p/pyftpdlib/issues/detail?id=100","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://code.google.com/p/pyftpdlib/source/detail?r=543","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://code.google.com/p/pyftpdlib/source/diff?spec=svn543\u0026r=543\u0026format=side\u0026path=/trunk/pyftpdlib/ftpserver.py","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-5011","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-8.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-62xg-239j-vxg7","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2009-5011","tags":["advisory"]},{"url":"https://github.com/giampaolo/pyftpdlib","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2009-5011","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.","status":"published","published":"2010-10-19T19:00:00Z","modified":"2024-09-17T02:42:48.968Z","updated_at":"2026-11-02T14:33:23.041383Z"}],"euvd":[{"id":"EUVD-2010-0026","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.","status":"published","published":"2010-10-19T19:00:00Z","modified":"2024-09-17T02:42:48Z","updated_at":"2026-11-03T00:28:37.764675Z"}],"ghsa":[{"id":"GHSA-62xg-239j-vxg7","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 0.5.2 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.","status":"published","published":"2022-05-02T04:00:27Z","modified":"2024-10-15T16:14:05Z","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-2009-5011","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.","status":"published","published":"2010-10-19T20:00:03.017Z","modified":"2026-06-16T23:14:49.43Z","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-62xg-239j-vxg7","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 0.5.2 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 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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.","status":"published","published":"2010-10-19T20:00:03.017Z","modified":"2026-10-23T17:47:25.069540097Z","updated_at":"2026-11-02T15:45:24.013654Z"},{"id":"PYSEC-2010-8","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.","status":"published","published":"2010-10-19T20:00:00Z","modified":"2023-11-08T03:56:54.616477Z","updated_at":"2026-11-02T15:52:51.254177Z"}]}}