IceWarp Email Server 12.3.0.1 allows remote attackers to upload files and consume disk space.
https://github.com/pinpinsec/Icewarp-Email-Server-12.3.0.1-unlimited_file_upload
https://www.icewarp.com/download-premise/server/
https://github.com/networksecure/icewarp_unlimited_file_upload