CVE-2023-42659

Name: CVE-2023-42659
Creator: NVD / NIST
Published: 2023-11-07T16:15:28.923+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.90%

Last modified Jun 17, 2026

CVE-2023-42659 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. . EPSS estimates a 0.90% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.90%

54.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Progress	Ws Ftp Server	< 8.7.6
Progress	Ws Ftp Server	>= 8.8.0, < 8.8.4

References

https://community.progress.com/s/article/WS-FTP-Server-Service-Pack-November-2023Vendor Advisory
https://www.progress.com/ws_ftpProduct
https://community.progress.com/s/article/WS-FTP-Server-Service-Pack-November-2023Vendor Advisory
https://www.progress.com/ws_ftpProduct

Timeline

Published: Nov 7, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-42659?

How severe is CVE-2023-42659?

CVE-2023-42659 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.

How do I fix CVE-2023-42659?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-42659?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST