{"id":"CVE-2010-3494","aliases":["GHSA-hw4g-fhcp-x5mq","PYSEC-2010-11"],"url":"https://o3.security/vulnerability/CVE-2010-3494","summary":"Concurrent Execution using Shared Resource with Improper Synchronization in pyftpdlib","details":"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.","published":"2010-10-19T20:00:04Z","modified":"2026-04-10T03:41:26.060107Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.02294,"percentile":0.81939,"asOf":"2026-08-22"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pyftpdlib","fixedVersion":"0.5.2"}],"fix":null,"references":[{"type":"FIX","url":"http://bugs.python.org/issue6706"},{"type":"WEB","url":"http://code.google.com/p/pyftpdlib/issues/detail?id=104"},{"type":"WEB","url":"http://code.google.com/p/pyftpdlib/issues/detail?id=105"},{"type":"WEB","url":"http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY"},{"type":"WEB","url":"http://code.google.com/p/pyftpdlib/source/detail?r=556"},{"type":"WEB","url":"http://code.google.com/p/pyftpdlib/source/diff?spec=svn556&r=556&format=side&path=/trunk/pyftpdlib/ftpserver.py"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2010/09/09/6"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2010/09/11/2"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2010/09/22/3"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2010/09/24/3"},{"type":"WEB","url":"https://bugs.launchpad.net/zodb/+bug/135108"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2010-3494"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-hw4g-fhcp-x5mq"},{"type":"PACKAGE","url":"https://github.com/giampaolo/pyftpdlib"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-11.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-04-10T03:41:26.060107Z"}}