This indicates an attack attempt to exploit a Remote Command Execution Vulnerability in FreeSWITCH.
The vulnerability is due to insufficient validation of user inputs when the vulnerable software handles a maliciously crafted request. A remote attacker may be able to exploit this to execute arbitrary command within the context of the application.
FreeSWITCH 1.6.10-17-726448d~44bit on FreeSWITCH-Deb8-TechPreview virtual machine
FreeSWITCH 1.8.4~64bit on Ubuntu 19.04 (x64)
FreeSWITCH 1.10.1~64bit on Windows 7 SP1 (EN) (x64)
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.