If was found that the NetTest web service can be used to overload the bandwidth of a Apache OpenMeetings server. This issue was addressed in Apache OpenMeetings 6.0.0
github.com/apache/openmeetings/commit/060a3114ad759931aeb42cd9afa9d1ebb39d3075
github.com/apache/openmeetings/commit/afe26c950b127776f2dfe920abff41a584874de8
github.com/apache/openmeetings/commit/cbdfd2f9731a8fe3daa9b4adf5da4a063fde161d
issues.apache.org/jira/browse/OPENMEETINGS-2551
lists.apache.org/thread.html/r9bb615bd70a0197368f5f3ffc887162686caeb0b5fc30592a7a871e9%40%3Cuser.openmeetings.apache.org%3E
nvd.nist.gov/vuln/detail/CVE-2021-27576
openmeetings.apache.org/security.html#cve-2021-27576---apache-openmeetings-bandwidth-can