An issue was discovered in Pascom Cloud Phone System before 7.20.x. In the management REST API, /services/apply in exd.pl allows remote attackers to execute arbitrary code via shell metacharacters.
https://www.pascom.net/doc/en/release-notes/
https://tutorialboy24.blogspot.com/2022/03/the-story-of-3-bugs-that-lead-to.html