# CVE-2023-40044

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.

- Page: https://www.vulneraibility.com/cve/CVE-2023-40044
- CVSS: 10.0
- Known exploited: yes, in CISA KEV since 2023-10-05; CISA due date 2023-10-26; known ransomware use
- EPSS: 90.35% (percentile 99.8)
- Public exploit code: 1 Metasploit module · 1 GitHub proof of concept · 1 Nuclei template (first 2023-10-02)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-02-03)
- Weakness: CWE-502
- Published: 2023-09-27

## Affected versions

- Progress Software Corporation WS_FTP Server: affected >= 8.8.0 and < 8.8.2; >= 8.7.0 and < 8.7.4

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://www.progress.com/ws_ftp
- [advisory] https://community.progress.com/s/article/WS-FTP-Server-Critical-Vulnerability-September-2023
- [other] https://www.theregister.com/2023/10/02/ws_ftp_update/
- [other] https://www.rapid7.com/blog/post/2023/09/29/etr-critical-vulnerabilities-in-ws_ftp-server/
- [other] https://attackerkb.com/topics/bn32f9sNax/cve-2023-40044
- [other] https://censys.com/cve-2023-40044/
- [other] https://www.assetnote.io/resources/research/rce-in-progress-ws-ftp-ad-hoc-via-iis-http-modules-cve-2023-40044
- [other] http://packetstormsecurity.com/files/174917/Progress-Software-WS_FTP-Unauthenticated-Remote-Code-Execution.html
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-40044

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.