A use-after-free issue could be triggered remotely in the SFTP component of PSFTPd 10.0.4 Build 729
Published Nov 15, 2017
5.9
MEDIUMCVSS 3.0
EPSS 8.74%
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.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (30 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.74% (0.08742) | 95.00th | v5 (v2026.06.15) |
| Sep 22, 2026 | 8.74% (0.08742) | 94.91th | v5 (v2026.06.15) |
| Sep 21, 2026 | 6.94% (0.06940) | 93.89th | v5 (v2026.06.15) |
| Sep 6, 2026 | 8.74% (0.08742) | 94.80th | v5 (v2026.06.15) |
| Sep 5, 2026 | 6.94% (0.06940) | 93.75th | v5 (v2026.06.15) |
| Aug 30, 2026 | 8.74% (0.08742) | 94.77th | v5 (v2026.06.15) |
| Aug 28, 2026 | 6.94% (0.06940) | 93.72th | v5 (v2026.06.15) |
| Aug 24, 2026 | 8.74% (0.08742) | 94.74th | v5 (v2026.06.15) |
| Aug 23, 2026 | 6.94% (0.06940) | 93.69th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.74% (0.08742) | 94.46th | v5 (v2026.06.15) |
| Sep 13, 2025 | 19.31% (0.19311) | 95.16th | v4 (v2025.03.14) |
| Mar 29, 2025 | 24.74% (0.24741) | 93.77th | v4 (v2025.03.14) |
| Mar 17, 2025 | 23.45% (0.23449) | 95.51th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.49% (0.00486) | 76.80th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.49% (0.00486) | 75.29th | v3 (v2023.03.01) |
| Oct 26, 2023 | 0.49% (0.00486) | 73.29th | v3 (v2023.03.01) |
| Aug 31, 2023 | 0.69% (0.00689) | 77.60th | v3 (v2023.03.01) |
| Jul 5, 2023 | 0.97% (0.00970) | 81.21th | v3 (v2023.03.01) |
| May 18, 2023 | 1.15% (0.01152) | 82.73th | v3 (v2023.03.01) |
| May 8, 2023 | 1.35% (0.01353) | 84.12th | v3 (v2023.03.01) |
| Apr 8, 2023 | 2.61% (0.02607) | 88.70th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.13% (0.03134) | 89.56th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 4.50% (0.04504) | 76.47th | v1 |
| Jan 6, 2022 | 4.50% (0.04504) | 76.26th | v1 |
| Sep 1, 2021 | 4.50% (0.04504) | 84.13th | v1 |
| Apr 14, 2021 | 4.50% (0.04504) | 0.00th | v1 |
References (4)
- http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html x_refsource_MISCThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/archive/1/541518/100/0/threaded mailing-listx_refsource_BUGTRAQ
- https://www.exploit-db.com/exploits/43144/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
- https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/ x_refsource_MISCThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html | x_refsource_MISCThird Party AdvisoryVDB Entry | |
| http://www.securityfocus.com/archive/1/541518/100/0/threaded | mailing-listx_refsource_BUGTRAQ | |
| https://www.exploit-db.com/exploits/43144/ | exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry | |
| https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/ | x_refsource_MISCThird Party Advisory |
Change history (0)
No recorded changes yet.