CVE-2023-42657: Progress WS_FTP Server

Critical severity, CVSS 9.6. EPSS: 16% chance of exploitation in the next 30 days.

In WS_FTP Server versions prior to 8.7.4 and 8.8.2, a directory traversal vulnerability was discovered.  An attacker could leverage this vulnerability to perform file operations (delete, rename, rmdir, mkdir) on files and folders outside of their authorized WS_FTP folder path.  Attackers could also escape the context of the WS_FTP Server file structure and perform the same level of operations (delete, rename, rmdir, mkdir) on file and folder locations on the underlying operating system.

Affected products

• Progress WS_FTP Server: before 8.7.4 (fixed in 8.7.4); from 8.8.0, before 8.8.2 (fixed in 8.8.2)

Published 2023-09-27. Last modified 2026-06-17.