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CVE-2023-40044

CriticalPublished

WS_FTP Server Ad Hoc Transfer Module .NET Deserialization Vulnerability

Published: Sep 27, 2023
Updated: Oct 21, 2025
Assigning CNA: ProgressSoftware
Evidence observed: Oct 5, 2023

Primary CVSS

10.0/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

90.2%

High · next 30 days

Percentile: 99.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

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.

Sources

WS_FTP-CVE-2023-40044Informational
Tracks impact of WS_FTP CVE-2023-40044 with affected organizations, domains, and header method analysis. Includes a news ticker for related stories.

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