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Vulnerability record · CVE-2017-15271 · published 15 November 2017

CVE-2017-15271: Psftpd use after free vulnerability

PPsftp · Psftpd

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.

5.9 CVSS 3.0 Medium EPSS 8.7% · top 5.0% CWE-416 · Use after free
5.9CVSS 3.0 base score, v2 4.3
8.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html Third Party AdvisoryVDB Entry
http://www.securityfocus.com/archive/1/541518/100/0/threaded
https://www.exploit-db.com/exploits/43144/ Third Party AdvisoryVDB Entry
https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/ Third Party Advisory
http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html Third Party AdvisoryVDB Entry
http://www.securityfocus.com/archive/1/541518/100/0/threaded
https://www.exploit-db.com/exploits/43144/ Third Party AdvisoryVDB Entry
https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/ Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

5.3CVE-2017-15270Psftpd improper input validation vulnerabilityThe PSFTPd 10.0.4 Build 729 server does not properly escape data before writing it into a Comma Separated Values (CSV) file. This can be used by atta…EPSS 7.0%5.3CVE-2017-15272Psftpd improper authentication vulnerabilityThe PSFTPd 10.0.4 Build 729 server stores its configuration inside PSFTPd.dat. This file is a Microsoft Access Database and can be extracted. The app…EPSS 0.56%4.3CVE-2017-15269Psftpd vulnerabilityThe PSFTPd 10.0.4 Build 729 server does not prevent FTP bounce scans by default. These can be performed using "nmap -b" and allow performing scans vi…EPSS 1.5%7.0CVE-2026-68820Windows Ancillary Function Driver for WinSock use-after-free privilege escalationThe Windows Ancillary Function Driver for WinSock (afd.sys) contains a use-after-free (CWE-416) that lets an authorized local attacker elevate privil…KEVEPSS 0.33%analysed8.8CVE-2010-0806Microsoft Internet Explorer Peer Objects use-after-free allows remote code executionInternet Explorer 6, 6 SP1 and 7 contain a use-after-free in the Peer Objects component (iepeers.dll), where an object is accessed after deletion, le…KEVEPSS 82%analysed8.8CVE-2010-0249Microsoft Internet Explorer use-after-free enables remote code executionInternet Explorer 6, 7 and 8 mishandle objects in memory, leaving a dangling pointer that can be reused after the object is freed. A remote attacker …KEVEPSS 92%analysed7.8CVE-2020-9715Adobe Acrobat and Reader use-after-free allows code executionAdobe Acrobat and Reader contain a use-after-free (CWE-416) flaw affecting versions 2020.009.20074 and earlier, 2020.001.30002, 2017.011.30171 and ea…KEVEPSS 49%analysed8.8CVE-2026-5281Google Chrome Dawn use-after-free allows remote code executionChrome versions before 146.0.7680.178 contain a use-after-free flaw in the Dawn graphics component. An attacker who has already compromised the rende…KEVEPSS 0.70%analysed

Source: NIST National Vulnerability Database (record CVE-2017-15271), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.