CVE-2024-9999: Multi-Factor Authentication Bypass in Progress WS_FTP Server

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-12 · updated 2026-06-17
Weakness: CWE-303

Description

In WS_FTP Server versions before 8.8.9 (2022.0.9), an Incorrect Implementation of Authentication Algorithm in the Web Transfer Module allows users to skip the second-factor verification and log in with username and password only.

Affected products

Progress Software Ws Ftp Server: before 8.8.9 — fixed in 8.8.9

How to fix

Upgrade to a fixed version: Progress Software Ws Ftp Server 8.8.9. Check the vendor advisory for mitigations.

References

https://community.progress.com/s/article/WS-FTP-Server-Service-Pack-November-2024
https://www.progress.com/ftp-server

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