CVE-2017-15271

Name: CVE-2017-15271
Creator: NVD / NIST
Published: 2017-11-15T16:29:00.373+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 8.74%

Last modified Jun 17, 2026

CVE-2017-15271 is a vulnerability of currently unknown severity. 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. EPSS estimates a 8.74% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

8.74%

94.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Psftp	Psftpd	10.0.4

References

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

Timeline

Published: Nov 15, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-15271?

How severe is CVE-2017-15271?

Severity scoring for CVE-2017-15271 is pending analysis. The EPSS model estimates a 8.74% probability of exploitation in the next 30 days.

How do I fix CVE-2017-15271?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-15271?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST