{"id":"CVE-2009-5011","url":"https://www.cyber-defence.io/tools/cve/CVE-2009-5011","generatedAt":"2026-10-27T19:56:55.756Z","title":"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…","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.","published":"2010-10-19T20:00:03.000Z","lastModified":"2026-06-16T23:14:49.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":4.3,"severity":"MEDIUM","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P"},"cwe":["CWE-362"],"affected":["g.rodola/pyftpdlib"],"epss":{"score":0.00916,"percentile":0.59918,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.92%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://code.google.com/p/pyftpdlib/issues/detail?id=100","source":"cve@mitre.org"},{"url":"http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY","source":"cve@mitre.org"},{"url":"http://code.google.com/p/pyftpdlib/source/detail?r=543","source":"cve@mitre.org"},{"url":"http://code.google.com/p/pyftpdlib/source/diff?spec=svn543&r=543&format=side&path=/trunk/pyftpdlib/ftpserver.py","source":"cve@mitre.org"},{"url":"http://code.google.com/p/pyftpdlib/issues/detail?id=100","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://code.google.com/p/pyftpdlib/source/detail?r=543","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://code.google.com/p/pyftpdlib/source/diff?spec=svn543&r=543&format=side&path=/trunk/pyftpdlib/ftpserver.py","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-5011","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}