{"id":"CVE-2017-15271","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-15271","generatedAt":"2026-10-29T00:41:17.188Z","title":"A use-after-free issue could be triggered remotely in the SFTP component of PSFTPd 10.0.4 Build 729.","description":"A use-after-free issue could be triggered remotely in the SFTP component of PSFTPd 10.0.4 Build 729. This issue could be triggered prior to authentication. The PSFTPd server did not automatically restart, which enabled attackers to perform a very effective DoS attack against this service. By sending a crafted SSH identification / version string to the server, a NULL pointer dereference could be caused, apparently because of a race condition in the window message handling, performing the cleanup for invalid connections. This incorrect cleanup code has a use-after-free.","published":"2017-11-15T16:29:00.000Z","lastModified":"2026-06-17T01:07:30.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-416"],"affected":["psftp/psftpd"],"epss":{"score":0.08742,"percentile":0.95127,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.0694,"percentile":0.93893},{"date":"2026-09-22","score":0.08742,"percentile":0.94914}]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2017-11-14","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":43144,"kind":"exploit","title":"PSFTPd Windows FTP Server 10.0.4 Build 729 - Log Injection / Use-After-Free","url":"https://www.exploit-db.com/exploits/43144","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/windows/dos/43144.txt","file":"exploits/windows/dos/43144.txt","published":"2017-11-14","added":"2017-11-14","updated":"2017-11-14","author":"X41 D-Sec GmbH","type":"dos","platform":"windows","port":null,"verified":false,"codes":["CVE-2017-15271","CVE-2017-15270"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"high","text":"A public exploit is published in Exploit-DB, so the technical barrier is gone even though the severity is medium and EPSS is 8.7%. Treat it as high on anything reachable from the internet."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/541518/100/0/threaded","source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/43144/","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/archive/1/541518/100/0/threaded","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/43144/","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-15271","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."}