CVE-2023-40044WS_FTP Server Ad Hoc Transfer Module .NET Deserialization Vulnerability

In plain English

A critical-severity unsafe deserialization in WS_FTP Server from Progress Software Corporation. Attackers are actively exploiting it in the wild (listed by CISA on October 5, 2023). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 90.4% (higher than 99.8% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.