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Status published
Critical
CVE-2023-40044
WS_FTP Server Ad Hoc Transfer Module .NET Deserialization Vulnerability
Vulnerability Description
In WS_FTP Server versions prior to 8.7.4 and 8.8.2, a pre-authenticated attacker could leverage a .NET deserialization vulnerability in the Ad Hoc Transfer module to execute remote commands on the underlying WS_FTP Server operating system.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Shubham Shah - Assetnote
- Sean Yeoh - Assetnote
References
- https://www.progress.com/ws_ftp
- https://community.progress.com/s/article/WS-FTP-Server-Critical-Vulnerability-September-2023
- https://www.theregister.com/2023/10/02/ws_ftp_update/
- https://www.rapid7.com/blog/post/2023/09/29/etr-critical-vulnerabilities-in-ws_ftp-server/
- https://attackerkb.com/topics/bn32f9sNax/cve-2023-40044
- https://censys.com/cve-2023-40044/
- https://www.assetnote.io/resources/research/rce-in-progress-ws-ftp-ad-hoc-via-iis-http-modules-cve-2023-40044
- http://packetstormsecurity.com/files/174917/Progress-Software-WS_FTP-Unauthenticated-Remote-Code-Execution.html
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Affected Vendor
Progress Software Corporation
View all reports →Affected Software
WS_FTP Server
Vulnerable Versions:
8.8.0, 8.7.0
Timeline
Official Publish:
September 27th, 2023
Last Modified:
October 21st, 2025
Added to House:
July 22nd, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H