CVE-2017-15271 EXPLOIT
5.9
MEDIUM · CVSS 3.0 · EPSS 8.7% (pctl 95)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 5.9 (MEDIUM, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| EPSS | 8.74% — more likely to be exploited than 95% of all CVEs |
| Weakness | CWE-416 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2017-11-15 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| psftp | psftpd |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | PSFTPd Windows FTP Server 10.0.4 Build 729 - Log Injection / Use-After-Free | 2017-11-14 |
References
- http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html
- http://www.securityfocus.com/archive/1/541518/100/0/threaded
- https://www.exploit-db.com/exploits/43144/
- https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/
- http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html
- http://www.securityfocus.com/archive/1/541518/100/0/threaded
- https://www.exploit-db.com/exploits/43144/
- https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/
→ the Explorer · watch your stack · NVD