What’s Vulnerable › Vulnerabilities

CVE-2023-42659: WS_FTP Server Arbitrary File Upload

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-07 · updated 2026-06-17
• Weakness: CWE-434

Description

In WS_FTP Server versions prior to 8.7.6 and 8.8.4, an unrestricted file upload flaw has been identified. An authenticated Ad Hoc Transfer user has the ability to craft an API call which allows them to upload a file to a specified location on the underlying operating system hosting the WS_FTP Server application.

Affected products

• Progress Software Corporation WS_FTP Server: before 8.7.6; from 8.8.0 before 8.8.4 — fixed in 8.7.6, 8.8.4

How to fix

Upgrade to a fixed version: Progress Software Corporation WS_FTP Server 8.7.6, 8.8.4. Check the vendor advisory for mitigations.

References

• https://community.progress.com/s/article/WS-FTP-Server-Service-Pack-November-2023
• https://www.progress.com/ws_ftp
• https://community.progress.com/s/article/WS-FTP-Server-Service-Pack-November-2023
• https://www.progress.com/ws_ftp

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