It was discovered that the bpserverd proprietary protocol in Unitrends Backup (UB) before 10.0.0, as invoked through xinetd, has an issue in which its authentication can be bypassed. A remote attacker could use this issue to execute arbitrary commands with root privilege on the target system.
https://www.exploit-db.com/exploits/43031/
https://support.unitrends.com/UnitrendsBackup/s/article/000005755